Fix typo in repo url
More repo url typo fixes
Handle play framework installation with puppet
Deploy as gitlab-bridge

This username is more descriptive and less likely to clash, and is
more semantic in that we are gonna run the service as it too.
Deploy as deploy user after all

This in fact helps with not having to open access to any more than one
user and the sudo config will be cleaner too.
Put play in /opt after all

Since we're deploying as the common deploy user, let's just dump
play in /opt/play and use that for everything. Also put the play
staging into the puppet file since we can't easily control the PATH
for playframework-capistrano and make it use the play install we want.