Github authorization

[gerwitz]

Wow, the Github setup is opaque.

Option 1: give instructions: https://help.github.com/articles/creating-a-personal-access-token-for-the-command-line/

Option 2: ask for credentials to request a token: https://github.com/octokit/octokit.rb#oauth-access-tokens

Option 3: proper OAuth flow: https://developer.github.com/apps/building-oauth-apps/authorization-options-for-oauth-apps/#web-application-flow