octokit/octokit.rb — pull request #292 by catsby (2013-08-12 21:58:56+00:00)
Title: Add option to check if a given user is following a target user

Implements this:
http://developer.github.com/v3/users/followers/#check-if-one-user-follows-another

References https://github.com/octokit/octokit.rb/issues/191#issuecomment-11106297