Allows you to setup a GitHub repository to create Annotations on git pushes.
Annotations are created like so:

    "GitHub: #{payload['pusher']['name']} has pushed
    #{payload['commits'].size} commit(s) to
    #{payload['repository']['name']}"

Install Notes
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1. **API Key** - Your API key. See: Settings tab, Personal Settings: https://app.copperegg.com/
2. **Tag** - Tag to automatically apply to each created Annotation.
3. **Master Only** - Only create Annotations for pushes to the master branch.
