Support token creation (and 2FA) from the command line

[afeld]

This should be possible, but will take a bit of tinkering with to figure out. Might also be nice to pull out into a dedicated gem/script that can be shared between non-browser tools.

• https://developer.github.com/v3/oauth_authorizations/#create-a-new-authorization
• https://developer.github.com/v3/oauth/#non-web-application-flow
• https://developer.github.com/v3/auth/
• https://github.com/github/hub/blob/e8122d6ce8d96a588db4bca282f31123b10f52b6/lib/hub/github_api.rb#L313-L344

Would love input from people that are smarter than me

/cc @mislav

[mislav]

The code you linked in hub is a good reference implementation. The process of obtaining the token is straightforward with the exception the dummy POST for 2FA that has a purpose of sending off an SMS, which a GET /authorizations won't do (there was some discussion whether this is an API bug).