Added class name upload to Parse Cloud. Also added data retrieval from P...

I added the functionalities for uploading the class Name to parse cloud. Also the app can now retrieve all the classes stored for a specific user and build the table view based on that data. Finally added a custom segue effect whenever the user cancels the action of uploading a new class.
Bugs to solve:
-Segue transitions after adding a new class
-Add button has to me aesthetically modified in order to fit in the general UI