Hack to use backbone event with visionmedia's uikit

backbone-uikit-events.patch

diff --git a/build/ui.js b/build/ui.js
index c934168..3fa754d 100644
--- a/build/ui.js
+++ b/build/ui.js
@@ -9,10 +9,29 @@ var ui = {};
 exports.Emitter = Emitter;
 
 /**
- * Alias emit to Backbone.Events.trigger
+ * Initialize a new `Emitter`.
+ * 
+ * @api public
  */
 
-Backbone.Events.emit = Backbone.Events.trigger;
+function Emitter() {
+  this.callbacks = {};
+};
+
+/**
+ * Listen on the given `event` with `fn`.
+ *
+ * @param {String} event
+ * @param {Function} fn
+ * @return {Emitter}
+ * @api public
+ */
+
+Emitter.prototype.on = function(event, fn){
+  (this.callbacks[event] = this.callbacks[event] || [])
+    .push(fn);
+  return this;
+};
 
 /**
  * Adds an `event` listener that will be invoked a single
@@ -24,7 +43,7 @@ Backbone.Events.emit = Backbone.Events.trigger;
  * @api public
  */
 
-Backbone.Events.once = function(event, fn){
+Emitter.prototype.once = function(event, fn){
   var self = this;
 
   function on() {
@@ -37,13 +56,50 @@ Backbone.Events.once = function(event, fn){
 };
 
 /**
- * Initialize a new `Emitter`.
- * 
+ * Remove the given callback for `event` or all
+ * registered callbacks.
+ *
+ * @param {String} event
+ * @param {Function} fn
+ * @return {Emitter}
  * @api public
  */
 
-function Emitter() {
-	_.extend(this, Backbone.Events);
+Emitter.prototype.off = function(event, fn){
+  var callbacks = this.callbacks[event];
+  if (!callbacks) return this;
+
+  // remove all handlers
+  if (1 == arguments.length) {
+    delete this.callbacks[event];
+    return this;
+  }
+
+  // remove specific handler
+  var i = callbacks.indexOf(fn);
+  callbacks.splice(i, 1);
+  return this;
+};
+
+/**
+ * Emit `event` with the given args.
+ *
+ * @param {String} event
+ * @param {Mixed} ...
+ * @return {Emitter} 
+ */
+
+Emitter.prototype.emit = function(event){
+  var args = [].slice.call(arguments, 1)
+    , callbacks = this.callbacks[event];
+
+  if (callbacks) {
+    for (var i = 0, len = callbacks.length; i < len; ++i) {
+      callbacks[i].apply(this, args)
+    }
+  }
+
+  return this;
 };
 
 })(ui);
@@ -543,7 +599,6 @@ function rgba(r,g,b,a) {
 /**
  * Mouse position util.
  */
-
 function localPos(e) {
   var offset = $(e.target).offset();
   return {
diff --git a/docs/backbone-min.js b/docs/backbone-min.js
deleted file mode 100644
index c1c0d4f..0000000
--- a/docs/backbone-min.js
+++ /dev/null
@@ -1,38 +0,0 @@
-// Backbone.js 0.9.2
-
-// (c) 2010-2012 Jeremy Ashkenas, DocumentCloud Inc.
-// Backbone may be freely distributed under the MIT license.
-// For all details and documentation:
-// http://backbonejs.org
-(function(){var l=this,y=l.Backbone,z=Array.prototype.slice,A=Array.prototype.splice,g;g="undefined"!==typeof exports?exports:l.Backbone={};g.VERSION="0.9.2";var f=l._;!f&&"undefined"!==typeof require&&(f=require("underscore"));var i=l.jQuery||l.Zepto||l.ender;g.setDomLibrary=function(a){i=a};g.noConflict=function(){l.Backbone=y;return this};g.emulateHTTP=!1;g.emulateJSON=!1;var p=/\s+/,k=g.Events={on:function(a,b,c){var d,e,f,g,j;if(!b)return this;a=a.split(p);for(d=this._callbacks||(this._callbacks=
-{});e=a.shift();)f=(j=d[e])?j.tail:{},f.next=g={},f.context=c,f.callback=b,d[e]={tail:g,next:j?j.next:f};return this},off:function(a,b,c){var d,e,h,g,j,q;if(e=this._callbacks){if(!a&&!b&&!c)return delete this._callbacks,this;for(a=a?a.split(p):f.keys(e);d=a.shift();)if(h=e[d],delete e[d],h&&(b||c))for(g=h.tail;(h=h.next)!==g;)if(j=h.callback,q=h.context,b&&j!==b||c&&q!==c)this.on(d,j,q);return this}},trigger:function(a){var b,c,d,e,f,g;if(!(d=this._callbacks))return this;f=d.all;a=a.split(p);for(g=
-z.call(arguments,1);b=a.shift();){if(c=d[b])for(e=c.tail;(c=c.next)!==e;)c.callback.apply(c.context||this,g);if(c=f){e=c.tail;for(b=[b].concat(g);(c=c.next)!==e;)c.callback.apply(c.context||this,b)}}return this}};k.bind=k.on;k.unbind=k.off;var o=g.Model=function(a,b){var c;a||(a={});b&&b.parse&&(a=this.parse(a));if(c=n(this,"defaults"))a=f.extend({},c,a);b&&b.collection&&(this.collection=b.collection);this.attributes={};this._escapedAttributes={};this.cid=f.uniqueId("c");this.changed={};this._silent=
-{};this._pending={};this.set(a,{silent:!0});this.changed={};this._silent={};this._pending={};this._previousAttributes=f.clone(this.attributes);this.initialize.apply(this,arguments)};f.extend(o.prototype,k,{changed:null,_silent:null,_pending:null,idAttribute:"id",initialize:function(){},toJSON:function(){return f.clone(this.attributes)},get:function(a){return this.attributes[a]},escape:function(a){var b;if(b=this._escapedAttributes[a])return b;b=this.get(a);return this._escapedAttributes[a]=f.escape(null==
-b?"":""+b)},has:function(a){return null!=this.get(a)},set:function(a,b,c){var d,e;f.isObject(a)||null==a?(d=a,c=b):(d={},d[a]=b);c||(c={});if(!d)return this;d instanceof o&&(d=d.attributes);if(c.unset)for(e in d)d[e]=void 0;if(!this._validate(d,c))return!1;this.idAttribute in d&&(this.id=d[this.idAttribute]);var b=c.changes={},h=this.attributes,g=this._escapedAttributes,j=this._previousAttributes||{};for(e in d){a=d[e];if(!f.isEqual(h[e],a)||c.unset&&f.has(h,e))delete g[e],(c.silent?this._silent:
-b)[e]=!0;c.unset?delete h[e]:h[e]=a;!f.isEqual(j[e],a)||f.has(h,e)!=f.has(j,e)?(this.changed[e]=a,c.silent||(this._pending[e]=!0)):(delete this.changed[e],delete this._pending[e])}c.silent||this.change(c);return this},unset:function(a,b){(b||(b={})).unset=!0;return this.set(a,null,b)},clear:function(a){(a||(a={})).unset=!0;return this.set(f.clone(this.attributes),a)},fetch:function(a){var a=a?f.clone(a):{},b=this,c=a.success;a.success=function(d,e,f){if(!b.set(b.parse(d,f),a))return!1;c&&c(b,d)};
-a.error=g.wrapError(a.error,b,a);return(this.sync||g.sync).call(this,"read",this,a)},save:function(a,b,c){var d,e;f.isObject(a)||null==a?(d=a,c=b):(d={},d[a]=b);c=c?f.clone(c):{};if(c.wait){if(!this._validate(d,c))return!1;e=f.clone(this.attributes)}a=f.extend({},c,{silent:!0});if(d&&!this.set(d,c.wait?a:c))return!1;var h=this,i=c.success;c.success=function(a,b,e){b=h.parse(a,e);if(c.wait){delete c.wait;b=f.extend(d||{},b)}if(!h.set(b,c))return false;i?i(h,a):h.trigger("sync",h,a,c)};c.error=g.wrapError(c.error,
-h,c);b=this.isNew()?"create":"update";b=(this.sync||g.sync).call(this,b,this,c);c.wait&&this.set(e,a);return b},destroy:function(a){var a=a?f.clone(a):{},b=this,c=a.success,d=function(){b.trigger("destroy",b,b.collection,a)};if(this.isNew())return d(),!1;a.success=function(e){a.wait&&d();c?c(b,e):b.trigger("sync",b,e,a)};a.error=g.wrapError(a.error,b,a);var e=(this.sync||g.sync).call(this,"delete",this,a);a.wait||d();return e},url:function(){var a=n(this,"urlRoot")||n(this.collection,"url")||t();
-return this.isNew()?a:a+("/"==a.charAt(a.length-1)?"":"/")+encodeURIComponent(this.id)},parse:function(a){return a},clone:function(){return new this.constructor(this.attributes)},isNew:function(){return null==this.id},change:function(a){a||(a={});var b=this._changing;this._changing=!0;for(var c in this._silent)this._pending[c]=!0;var d=f.extend({},a.changes,this._silent);this._silent={};for(c in d)this.trigger("change:"+c,this,this.get(c),a);if(b)return this;for(;!f.isEmpty(this._pending);){this._pending=
-{};this.trigger("change",this,a);for(c in this.changed)!this._pending[c]&&!this._silent[c]&&delete this.changed[c];this._previousAttributes=f.clone(this.attributes)}this._changing=!1;return this},hasChanged:function(a){return!arguments.length?!f.isEmpty(this.changed):f.has(this.changed,a)},changedAttributes:function(a){if(!a)return this.hasChanged()?f.clone(this.changed):!1;var b,c=!1,d=this._previousAttributes,e;for(e in a)if(!f.isEqual(d[e],b=a[e]))(c||(c={}))[e]=b;return c},previous:function(a){return!arguments.length||
-!this._previousAttributes?null:this._previousAttributes[a]},previousAttributes:function(){return f.clone(this._previousAttributes)},isValid:function(){return!this.validate(this.attributes)},_validate:function(a,b){if(b.silent||!this.validate)return!0;var a=f.extend({},this.attributes,a),c=this.validate(a,b);if(!c)return!0;b&&b.error?b.error(this,c,b):this.trigger("error",this,c,b);return!1}});var r=g.Collection=function(a,b){b||(b={});b.model&&(this.model=b.model);b.comparator&&(this.comparator=b.comparator);
-this._reset();this.initialize.apply(this,arguments);a&&this.reset(a,{silent:!0,parse:b.parse})};f.extend(r.prototype,k,{model:o,initialize:function(){},toJSON:function(a){return this.map(function(b){return b.toJSON(a)})},add:function(a,b){var c,d,e,g,i,j={},k={},l=[];b||(b={});a=f.isArray(a)?a.slice():[a];c=0;for(d=a.length;c<d;c++){if(!(e=a[c]=this._prepareModel(a[c],b)))throw Error("Can't add an invalid model to a collection");g=e.cid;i=e.id;j[g]||this._byCid[g]||null!=i&&(k[i]||this._byId[i])?
-l.push(c):j[g]=k[i]=e}for(c=l.length;c--;)a.splice(l[c],1);c=0;for(d=a.length;c<d;c++)(e=a[c]).on("all",this._onModelEvent,this),this._byCid[e.cid]=e,null!=e.id&&(this._byId[e.id]=e);this.length+=d;A.apply(this.models,[null!=b.at?b.at:this.models.length,0].concat(a));this.comparator&&this.sort({silent:!0});if(b.silent)return this;c=0;for(d=this.models.length;c<d;c++)if(j[(e=this.models[c]).cid])b.index=c,e.trigger("add",e,this,b);return this},remove:function(a,b){var c,d,e,g;b||(b={});a=f.isArray(a)?
-a.slice():[a];c=0;for(d=a.length;c<d;c++)if(g=this.getByCid(a[c])||this.get(a[c]))delete this._byId[g.id],delete this._byCid[g.cid],e=this.indexOf(g),this.models.splice(e,1),this.length--,b.silent||(b.index=e,g.trigger("remove",g,this,b)),this._removeReference(g);return this},push:function(a,b){a=this._prepareModel(a,b);this.add(a,b);return a},pop:function(a){var b=this.at(this.length-1);this.remove(b,a);return b},unshift:function(a,b){a=this._prepareModel(a,b);this.add(a,f.extend({at:0},b));return a},
-shift:function(a){var b=this.at(0);this.remove(b,a);return b},get:function(a){return null==a?void 0:this._byId[null!=a.id?a.id:a]},getByCid:function(a){return a&&this._byCid[a.cid||a]},at:function(a){return this.models[a]},where:function(a){return f.isEmpty(a)?[]:this.filter(function(b){for(var c in a)if(a[c]!==b.get(c))return!1;return!0})},sort:function(a){a||(a={});if(!this.comparator)throw Error("Cannot sort a set without a comparator");var b=f.bind(this.comparator,this);1==this.comparator.length?
-this.models=this.sortBy(b):this.models.sort(b);a.silent||this.trigger("reset",this,a);return this},pluck:function(a){return f.map(this.models,function(b){return b.get(a)})},reset:function(a,b){a||(a=[]);b||(b={});for(var c=0,d=this.models.length;c<d;c++)this._removeReference(this.models[c]);this._reset();this.add(a,f.extend({silent:!0},b));b.silent||this.trigger("reset",this,b);return this},fetch:function(a){a=a?f.clone(a):{};void 0===a.parse&&(a.parse=!0);var b=this,c=a.success;a.success=function(d,
-e,f){b[a.add?"add":"reset"](b.parse(d,f),a);c&&c(b,d)};a.error=g.wrapError(a.error,b,a);return(this.sync||g.sync).call(this,"read",this,a)},create:function(a,b){var c=this,b=b?f.clone(b):{},a=this._prepareModel(a,b);if(!a)return!1;b.wait||c.add(a,b);var d=b.success;b.success=function(e,f){b.wait&&c.add(e,b);d?d(e,f):e.trigger("sync",a,f,b)};a.save(null,b);return a},parse:function(a){return a},chain:function(){return f(this.models).chain()},_reset:function(){this.length=0;this.models=[];this._byId=
-{};this._byCid={}},_prepareModel:function(a,b){b||(b={});a instanceof o?a.collection||(a.collection=this):(b.collection=this,a=new this.model(a,b),a._validate(a.attributes,b)||(a=!1));return a},_removeReference:function(a){this==a.collection&&delete a.collection;a.off("all",this._onModelEvent,this)},_onModelEvent:function(a,b,c,d){("add"==a||"remove"==a)&&c!=this||("destroy"==a&&this.remove(b,d),b&&a==="change:"+b.idAttribute&&(delete this._byId[b.previous(b.idAttribute)],this._byId[b.id]=b),this.trigger.apply(this,
-arguments))}});f.each("forEach,each,map,reduce,reduceRight,find,detect,filter,select,reject,every,all,some,any,include,contains,invoke,max,min,sortBy,sortedIndex,toArray,size,first,initial,rest,last,without,indexOf,shuffle,lastIndexOf,isEmpty,groupBy".split(","),function(a){r.prototype[a]=function(){return f[a].apply(f,[this.models].concat(f.toArray(arguments)))}});var u=g.Router=function(a){a||(a={});a.routes&&(this.routes=a.routes);this._bindRoutes();this.initialize.apply(this,arguments)},B=/:\w+/g,
-C=/\*\w+/g,D=/[-[\]{}()+?.,\\^$|#\s]/g;f.extend(u.prototype,k,{initialize:function(){},route:function(a,b,c){g.history||(g.history=new m);f.isRegExp(a)||(a=this._routeToRegExp(a));c||(c=this[b]);g.history.route(a,f.bind(function(d){d=this._extractParameters(a,d);c&&c.apply(this,d);this.trigger.apply(this,["route:"+b].concat(d));g.history.trigger("route",this,b,d)},this));return this},navigate:function(a,b){g.history.navigate(a,b)},_bindRoutes:function(){if(this.routes){var a=[],b;for(b in this.routes)a.unshift([b,
-this.routes[b]]);b=0;for(var c=a.length;b<c;b++)this.route(a[b][0],a[b][1],this[a[b][1]])}},_routeToRegExp:function(a){a=a.replace(D,"\\$&").replace(B,"([^/]+)").replace(C,"(.*?)");return RegExp("^"+a+"$")},_extractParameters:function(a,b){return a.exec(b).slice(1)}});var m=g.History=function(){this.handlers=[];f.bindAll(this,"checkUrl")},s=/^[#\/]/,E=/msie [\w.]+/;m.started=!1;f.extend(m.prototype,k,{interval:50,getHash:function(a){return(a=(a?a.location:window.location).href.match(/#(.*)$/))?a[1]:
-""},getFragment:function(a,b){if(null==a)if(this._hasPushState||b){var a=window.location.pathname,c=window.location.search;c&&(a+=c)}else a=this.getHash();a.indexOf(this.options.root)||(a=a.substr(this.options.root.length));return a.replace(s,"")},start:function(a){if(m.started)throw Error("Backbone.history has already been started");m.started=!0;this.options=f.extend({},{root:"/"},this.options,a);this._wantsHashChange=!1!==this.options.hashChange;this._wantsPushState=!!this.options.pushState;this._hasPushState=
-!(!this.options.pushState||!window.history||!window.history.pushState);var a=this.getFragment(),b=document.documentMode;if(b=E.exec(navigator.userAgent.toLowerCase())&&(!b||7>=b))this.iframe=i('<iframe src="javascript:0" tabindex="-1" />').hide().appendTo("body")[0].contentWindow,this.navigate(a);this._hasPushState?i(window).bind("popstate",this.checkUrl):this._wantsHashChange&&"onhashchange"in window&&!b?i(window).bind("hashchange",this.checkUrl):this._wantsHashChange&&(this._checkUrlInterval=setInterval(this.checkUrl,
-this.interval));this.fragment=a;a=window.location;b=a.pathname==this.options.root;if(this._wantsHashChange&&this._wantsPushState&&!this._hasPushState&&!b)return this.fragment=this.getFragment(null,!0),window.location.replace(this.options.root+"#"+this.fragment),!0;this._wantsPushState&&this._hasPushState&&b&&a.hash&&(this.fragment=this.getHash().replace(s,""),window.history.replaceState({},document.title,a.protocol+"//"+a.host+this.options.root+this.fragment));if(!this.options.silent)return this.loadUrl()},
-stop:function(){i(window).unbind("popstate",this.checkUrl).unbind("hashchange",this.checkUrl);clearInterval(this._checkUrlInterval);m.started=!1},route:function(a,b){this.handlers.unshift({route:a,callback:b})},checkUrl:function(){var a=this.getFragment();a==this.fragment&&this.iframe&&(a=this.getFragment(this.getHash(this.iframe)));if(a==this.fragment)return!1;this.iframe&&this.navigate(a);this.loadUrl()||this.loadUrl(this.getHash())},loadUrl:function(a){var b=this.fragment=this.getFragment(a);return f.any(this.handlers,
-function(a){if(a.route.test(b))return a.callback(b),!0})},navigate:function(a,b){if(!m.started)return!1;if(!b||!0===b)b={trigger:b};var c=(a||"").replace(s,"");this.fragment!=c&&(this._hasPushState?(0!=c.indexOf(this.options.root)&&(c=this.options.root+c),this.fragment=c,window.history[b.replace?"replaceState":"pushState"]({},document.title,c)):this._wantsHashChange?(this.fragment=c,this._updateHash(window.location,c,b.replace),this.iframe&&c!=this.getFragment(this.getHash(this.iframe))&&(b.replace||
-this.iframe.document.open().close(),this._updateHash(this.iframe.location,c,b.replace))):window.location.assign(this.options.root+a),b.trigger&&this.loadUrl(a))},_updateHash:function(a,b,c){c?a.replace(a.toString().replace(/(javascript:|#).*$/,"")+"#"+b):a.hash=b}});var v=g.View=function(a){this.cid=f.uniqueId("view");this._configure(a||{});this._ensureElement();this.initialize.apply(this,arguments);this.delegateEvents()},F=/^(\S+)\s*(.*)$/,w="model,collection,el,id,attributes,className,tagName".split(",");
-f.extend(v.prototype,k,{tagName:"div",$:function(a){return this.$el.find(a)},initialize:function(){},render:function(){return this},remove:function(){this.$el.remove();return this},make:function(a,b,c){a=document.createElement(a);b&&i(a).attr(b);c&&i(a).html(c);return a},setElement:function(a,b){this.$el&&this.undelegateEvents();this.$el=a instanceof i?a:i(a);this.el=this.$el[0];!1!==b&&this.delegateEvents();return this},delegateEvents:function(a){if(a||(a=n(this,"events"))){this.undelegateEvents();
-for(var b in a){var c=a[b];f.isFunction(c)||(c=this[a[b]]);if(!c)throw Error('Method "'+a[b]+'" does not exist');var d=b.match(F),e=d[1],d=d[2],c=f.bind(c,this),e=e+(".delegateEvents"+this.cid);""===d?this.$el.bind(e,c):this.$el.delegate(d,e,c)}}},undelegateEvents:function(){this.$el.unbind(".delegateEvents"+this.cid)},_configure:function(a){this.options&&(a=f.extend({},this.options,a));for(var b=0,c=w.length;b<c;b++){var d=w[b];a[d]&&(this[d]=a[d])}this.options=a},_ensureElement:function(){if(this.el)this.setElement(this.el,
-!1);else{var a=n(this,"attributes")||{};this.id&&(a.id=this.id);this.className&&(a["class"]=this.className);this.setElement(this.make(this.tagName,a),!1)}}});o.extend=r.extend=u.extend=v.extend=function(a,b){var c=G(this,a,b);c.extend=this.extend;return c};var H={create:"POST",update:"PUT","delete":"DELETE",read:"GET"};g.sync=function(a,b,c){var d=H[a];c||(c={});var e={type:d,dataType:"json"};c.url||(e.url=n(b,"url")||t());if(!c.data&&b&&("create"==a||"update"==a))e.contentType="application/json",
-e.data=JSON.stringify(b.toJSON());g.emulateJSON&&(e.contentType="application/x-www-form-urlencoded",e.data=e.data?{model:e.data}:{});if(g.emulateHTTP&&("PUT"===d||"DELETE"===d))g.emulateJSON&&(e.data._method=d),e.type="POST",e.beforeSend=function(a){a.setRequestHeader("X-HTTP-Method-Override",d)};"GET"!==e.type&&!g.emulateJSON&&(e.processData=!1);return i.ajax(f.extend(e,c))};g.wrapError=function(a,b,c){return function(d,e){e=d===b?e:d;a?a(b,e,c):b.trigger("error",b,e,c)}};var x=function(){},G=function(a,
-b,c){var d;d=b&&b.hasOwnProperty("constructor")?b.constructor:function(){a.apply(this,arguments)};f.extend(d,a);x.prototype=a.prototype;d.prototype=new x;b&&f.extend(d.prototype,b);c&&f.extend(d,c);d.prototype.constructor=d;d.__super__=a.prototype;return d},n=function(a,b){return!a||!a[b]?null:f.isFunction(a[b])?a[b]():a[b]},t=function(){throw Error('A "url" property or function must be specified');}}).call(this);
diff --git a/docs/index.html b/docs/index.html
index 33feba8..e25c46e 100644
--- a/docs/index.html
+++ b/docs/index.html
@@ -4,8 +4,6 @@
     <title>UIKit - Modern UI components for a modern web</title>
     <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
     <script src="jquery.js"></script>
-    <script src="underscore-min.js"></script>
-    <script src="backbone-min.js"></script>
     <script src="../build/ui.js"></script>
     <script src="highlight.js"></script>
     <link rel="stylesheet" href="../build/ui.css">
diff --git a/docs/underscore-min.js b/docs/underscore-min.js
deleted file mode 100644
index 5b55f32..0000000
--- a/docs/underscore-min.js
+++ /dev/null
@@ -1,31 +0,0 @@
-// Underscore.js 1.3.1
-// (c) 2009-2012 Jeremy Ashkenas, DocumentCloud Inc.
-// Underscore is freely distributable under the MIT license.
-// Portions of Underscore are inspired or borrowed from Prototype,
-// Oliver Steele's Functional, and John Resig's Micro-Templating.
-// For all details and documentation:
-// http://documentcloud.github.com/underscore
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diff --git a/lib/components/emitter/emitter.js b/lib/components/emitter/emitter.js
index 68d626f..6e0f9d0 100644
--- a/lib/components/emitter/emitter.js
+++ b/lib/components/emitter/emitter.js
@@ -6,10 +6,29 @@
 exports.Emitter = Emitter;
 
 /**
- * Alias emit to Backbone.Events.trigger
+ * Initialize a new `Emitter`.
+ * 
+ * @api public
  */
 
-Backbone.Events.emit = Backbone.Events.trigger;
+function Emitter() {
+  this.callbacks = {};
+};
+
+/**
+ * Listen on the given `event` with `fn`.
+ *
+ * @param {String} event
+ * @param {Function} fn
+ * @return {Emitter}
+ * @api public
+ */
+
+Emitter.prototype.on = function(event, fn){
+  (this.callbacks[event] = this.callbacks[event] || [])
+    .push(fn);
+  return this;
+};
 
 /**
  * Adds an `event` listener that will be invoked a single
@@ -21,7 +40,7 @@ Backbone.Events.emit = Backbone.Events.trigger;
  * @api public
  */
 
-Backbone.Events.once = function(event, fn){
+Emitter.prototype.once = function(event, fn){
   var self = this;
 
   function on() {
@@ -34,11 +53,48 @@ Backbone.Events.once = function(event, fn){
 };
 
 /**
- * Initialize a new `Emitter`.
- * 
+ * Remove the given callback for `event` or all
+ * registered callbacks.
+ *
+ * @param {String} event
+ * @param {Function} fn
+ * @return {Emitter}
  * @api public
  */
 
-function Emitter() {
-	_.extend(this, Backbone.Events);
+Emitter.prototype.off = function(event, fn){
+  var callbacks = this.callbacks[event];
+  if (!callbacks) return this;
+
+  // remove all handlers
+  if (1 == arguments.length) {
+    delete this.callbacks[event];
+    return this;
+  }
+
+  // remove specific handler
+  var i = callbacks.indexOf(fn);
+  callbacks.splice(i, 1);
+  return this;
+};
+
+/**
+ * Emit `event` with the given args.
+ *
+ * @param {String} event
+ * @param {Mixed} ...
+ * @return {Emitter} 
+ */
+
+Emitter.prototype.emit = function(event){
+  var args = [].slice.call(arguments, 1)
+    , callbacks = this.callbacks[event];
+
+  if (callbacks) {
+    for (var i = 0, len = callbacks.length; i < len; ++i) {
+      callbacks[i].apply(this, args)
+    }
+  }
+
+  return this;
 };