Implement Repository Contents API

[hnrkndrssn]

http://developer.github.com/v3/repos/contents/

• http://developer.github.com/v3/repos/contents/#get-contents
• http://developer.github.com/v3/repos/contents/#create-a-file
• http://developer.github.com/v3/repos/contents/#update-a-file
• http://developer.github.com/v3/repos/contents/#delete-a-file
• [ ] http://developer.github.com/v3/repos/contents/#get-archive-link moved to Get Archive Link for Repository Contents #748

[khellang]

Nooooo! This is not in yet? Has someone started on this? 😄

[hnrkndrssn]

Someone has started it, here -> #231

[shiftkey]

This finally landed in #649