Draggable Decorator

[Iheartweb]

Requested by @Iheartweb
see issue #145

[Iheartweb]

This should be done as decorator so that all elements are potentially draggable.

[Iheartweb]

function DraggableDecorator( settings ){
  return function( base ){
    var $handle = settings.$handle;
    function start(){}
    function end(){}
  }
}