add gitlab endpoint to print_plan
fixes to gitlabclient
add --ref and --embed_as; fetching from gitlab working

--ref (-r) lets you specify a branch/tag. Currently required as the latest_tag detection hasn't been implemented for gitlab.

--embed_as (-e) lets you generate a rails app that is a subdirectory of a new/existing project. If the project dir already has a .git, it doesn't do a git init.