CoffeeScript class utility functions

gistfile1.coffee

__hasProp = {}.hasOwnProperty,
__extends = function(child, parent) 
{ 
   for (var key in parent) 
   { 
      if (__hasProp.call(parent, key)) 
         child[key] = parent[key]; 
   } 
         
   function ctor() 
   { 
      this.constructor = child; 
   } 
   ctor.prototype = parent.prototype; 
   child.prototype = new ctor(); 
   child.__super__ = parent.prototype; 
   return child; 
 };