User Dashboard: Github OAuth

[jmejia]

Details: We want a user to have the option to connect their Github account and retrieve a user specific token automatically.

As a user
When I visit /dashboard
Then I should see a link that is styled like a button that says "Connect to Github"
And when I click on "Connect to Github"
Then I should go through the OAuth process
And I should be redirected to /dashboard
And I should see all of the content from the previous Github stories (repos, followers, and following)

Tips: Testing this is tricky. Don't worry about testing during the spike. In fact, TDD'ing this is really tricky if you've never done it before. Get a working implementation first even when you are pairing and backfill a test. You should not try to fill out the form and click buttons on Github in your tests. Omniauth gives us a special way to test this. Use these docs as a starting point: https://github.com/omniauth/omniauth/wiki/Integration-Testing

• Uses Omniauth Github (does not hand roll the OAuth handshake)
• Tests the handshake using Omniauth Mock Auth (see above tips section).