Add optional revision parameter to import_or_clone
Update setup/start scripts

- Split scripts for gatekeeper and mezuro
- Add optional feature selection in config
- Add initial apt-get update to mezuro image
Update PhantomJS support
Update gitignore
Merge branch 'master' of github.com:mezuro/mezuro_docker

* 'master' of github.com:mezuro/mezuro_docker:
  Restore ruby version

Conflicts:
	mezuro/Dockerfile-gatekeeper.erb