Octocat version bump for Github Enterprise support.

[jroyleaz]

The latest version of Octocat (0.12.1) has native support for Github Enterprise, you just need to provide the full URI. Within the context of Nuts this means setting GITHUB_ENDPOINT to something like https://ghe.somecompany.com/api/v3.

[ethangodt]

can we please merge this?

[loprima-l]

Hi, I merged the project to a new repo to start maintain it, I would be glad if you can put your pull request here : https://github.com/loprima-l/nuts-2