To the loginController, added notification handling
	register how to process notifications and which notifications to look for inside the viewDidLoad function
	create sessionStateChanged function to actually process the notification.
remove synchronization code that did not work.
Add a viewDidUnload function upon suggestion from fbsamples. (this handles getting rid of subtasks and removes the Notification observer that was registered)
In AppDelegate, modify openSession function to accommodate a parameter which allows or disallows the Facebook provided UI.
	remove repetitive code from didFinishLaunchingWithOptions as this is now handled in the view controllers.
	Add the code to post notifications to the session so they can be read by the notification readers.
Create a welcome screen for login to unwind into.