Global install, enhanced CLI, idea

Say we install this hook somewhere, add it to the path.

Now we can say:

// Enable githooks for this repo, creates the yml file for you
> githooks init

// No args gives you status information
> githooks

// Allow githooks to update config for you
> githooks config add-protected-branch "release/*"

This would be much easier and make more sense after #61 or something similar