Add Ability To Call Destroy From jQuery Function

[EricMaibach]

Adds the ability to call the destroy method from the jQuery function

To call the destroy method using jQuery just call the dragend method and pass in a setting the sets the destroy property to true. For example:

$("#dragendcont").dragend( {destroy: true } );

Without this change you need a instance of the dragend object to call the destory method. For example:

var instance = new Dragend();
instance.destroy();