updated ls_rest_adapter.js to successfully merge data from server into local storage and edited timestamp_transform to correspond to the format send by the server.
Also updated Gruntfie.js
updated ModelController.php and RequestHandler.php to take the since parameter on find all request to the model
Added new functions _JsonStringifyHasMany and _updateLocalStorage to ls_rest_adapter.js and reformatted findAll function.
Also added the timestamp format to the variable window.timestampFormat initialized in timestamp_transform.js
Merge branch 'data_persistence_handling'

Conflicts:
	client/Gruntfile.js
	client/app/transforms/timestamp_transform.js
	server/factory/RequestHandler.php