[#1] Code from elvis_github.
[#1] Updated to latest version of elvis_github.
[#1] Removed basic_auth generation function.
[#1] Basic auth and OAuth credentials functions.
[#1] Fixed elvis comments. Added elvis.config.
Merge pull request #5 from inaka/jfacorro.1.github.api.v3

[Closes #1] Github API v3