Used PFUser to create new User object based on user input fields at Sign Up, set username and password values and save data to Parse.com
Additional Comments added to Sign Up to explain Asynchronous back-end Multi-threading and Callback mechanism Block
Connected LoginViewController Text Fields and Button to IBOutlets and IBActions allowing Users to Login
Added Check to see if Current User Login session active. Only shows Login screen if not logged in
Merge pull request #5 from ltfschoen/20140508

Merge