Initial parse login

this combines the first two steps /cc @guymorita @mhahn 

I didn't get to the login screen yet. For now you can use this: https://www.parse.com/docs/ios_guide#users/iOS

Sign Up:
https://www.parse.com/docs/ios_guide#users-signup/iOS

Login:
https://www.parse.com/docs/ios_guide#users-login/iOS

I may get to this tonight.