Only support redirect auth (#904)
Only support redirect auth (#904)

Navigate to /auth/handshake when signing in, remove unnecessary code.
travis-ci/travis-web,travis-ci/travis-web,fotinakis/travis-web,fotinakis/travis-web,fotinakis/travis-web,fotinakis/travis-web,travis-ci/travis-web,travis-ci/travis-web