OAuth login

Am now able to login and get the oauth access tokens from both FB and Google. LoginActivity's a bit messy, but it works.

Not sure if my .gitignore is set up correctly or if it's because my initial commit didn't have the .gitignore so now I need to manually remove the ignored files.

Also, the indentation seems to be a bit off when viewed in github even though it looks fine in Eclipse and Sublime. Not sure why..

@ParthPadg can you review when you have time? Thanks!