Apply yellow background color to text fields.
Resolves #4: Center align elements in signup page.
Add parse.com framework to project.
Add frameworks needed by prase.com
Add Service Key file.

Store parse.com AppID and ClientKey.
Add ATServiceKeys.h file.
Resolves #5: Incorporate Parse.com
Remove Service Keys file from version control.
Ignore ATServieKeys.h
Implement submit button handler.
Add new files.

Add tab bar controller to display:
* friends
* inbox
* camera
Go to tab bar controller on login button press.
Code cleanup.
Change button title text colour on tap.
Present login page modally.