Start, Stop, Destroy handlers and methods

• Now returns an instance of the plugin itself along with the dom elements
• Adds "start" and "stop" handlers to the already existing "destroy" handler
• The new "stop" handler does what the old "destroy" handler used to do, while "destroy" now removes completely all html markup produced by the plugin and all associated data
• Adds "destroy()", "start()" and "stop()" methods which have the same effect as the handlers.