Social login

@nockertsb I had to rewrite the history on master since the private keys for twitter and facebook were on there. I moved the two commits you made to a new branch and did not make any modifications. I'll do a review and tag you when I'm all through.
Take a look at using `ButterKnife` for these view injections. Also use it for the `View.OnClickListener` injection. http://jakewharton.github.io/butterknife/