Inheritance

moduleKeywords =['extended,included']
class module
  @extend: (obj) ->
    for key, value of obj when key not in moduleKeywords
      @[key] = value

    obj.extended?.apply(@)
    this
  @include: (obj) ->
    for key, value of obj when key not in moduleKeywords
      @::[key] = value
    obj.included?.apply(@)
    this