Add docs badge to README
Update docs badge in README

Update the URL of the docs badge to include it from inch-ci.org instead of inch-pages.github.io (the former being the successor of the Inch Pages project).

[ci skip]
Add pronto-haml to the list of runners in README
Merge pull request #22 from rrrene/patch-1

Add docs badge to README
Add CONTRIBUTING.md
WIP: Adds GitLab formatter