Local Git Setup

See https://gist.github.com/daurnimator/fbc82fe9455689ad4c30e3a322db828a

• pre-commit hook based on http://daurnimator.com/post/134519891749/testing-pre-commit-with-git
• pre-push that keeps scm-0 rockspec updated at luarocks
• helper to push docs