Unified bind/unbind methods

Simple binding for kaltura events.

kWidget.addReadyCallback( function( playerId ){
	var kdp = document.getElementById( playerId );
	var foo = "bar";
	// Unlike addJsListener, you can directly issue local callbacks.
	kdp.kBind( "doPlay.test", function(){ //notice the .test postfix namespaces the event)
		console.log("play " + foo); // will log "play bar"
		//Now we can unbind our .test postfix via kUnbind ( only will log play once )
		kdp.kUnbind('.test')
	});
});