added display variable that hides button

leaflet.button.js

// from https://gist.github.com/emtiu/6098482

// Modified from fork origin:
// Adapted for use in https://github.com/dave-null/piratenmandate-frontend

// Usage:
//   var someButton = new L.Control.Button(options).addTo(map);
// This calls OnAdd(). See the code for what options are required
// The third parameter passed to L.DomEvent.addListener is the 'this' context
// to use in the callback (second parameter).

L.Control.Button = L.Control.extend({
  options: {
    position: mapSettings.extraButtonPosition
  },
  initialize: function (options) {
    this._button = {};
    this.setButton(options);
  },

  onAdd: function (map) {
    this._map = map;
    var container = L.DomUtil.create('div', 'leaflet-control-button');

    this._container = container;

    this._update();
    return this._container;
  },

  onRemove: function (map) {
  },

  setButton: function (options) {
    var button = {
       'text': options.text //string
      ,'class': options.class //string
      ,'onClick': options.onClick //callback function
      ,'doToggle': options.toggle //bool
      ,'toggleStatus': false //bool
      ,'display': options.display //bool
    };

    this._button = button;
    this._update();
  },

  getText: function () {
    return this._button.text;
  },

  destroy: function () {
    this._button = {};
    this._update();
  },

  toggle: function (e) {
    if(typeof e === 'boolean'){
      this._button.toggleStatus = e;
    }
    else{
      this._button.toggleStatus = !this._button.toggleStatus;
    }
    this._update();
  },

  _update: function () {
    if (!this._map) {
      return;
    }

    this._container.innerHTML = '';
    this._makeButton(this._button);
  },

  _makeButton: function (button) {
    var newButton = L.DomUtil.create('div', 'leaflet-buttons-control-button '+button.class, this._container);
    if (button.display == false) { L.DomUtil.addClass(this._container, 'hidden'); }
    else { L.DomUtil.removeClass(this._container, 'hidden'); }

    if(button.toggleStatus)
      L.DomUtil.addClass(newButton,'leaflet-buttons-control-toggleon');

    if(button.text !== ''){

      var span = L.DomUtil.create('span', 'leaflet-buttons-control-text', newButton);
      var text = document.createTextNode(button.text);  //is there an L.DomUtil for this?
      span.appendChild(text);
    }

    L.DomEvent
      .addListener(newButton, 'click', L.DomEvent.stop)
      .addListener(newButton, 'click', button.onClick,this)
      .addListener(newButton, 'click', this._clicked,this);
    L.DomEvent.disableClickPropagation(newButton);
    return newButton;

  },

  _clicked: function () {  //'this' refers to button
    if(this._button.doToggle){
      if(this._button.toggleStatus) {	//currently true, remove class
        L.DomUtil.removeClass(this._container.childNodes[0],'leaflet-buttons-control-toggleon');
      }
      else{
        L.DomUtil.addClass(this._container.childNodes[0],'leaflet-buttons-control-toggleon');
      }
      this.toggle();
    }
    return;
  }

});