Issues #19 #25 #26

Release target, Gitlab CB v0.5.0

* Database back-end changes via @sethvargo
  - Adds a mysql and postgresql database creation
  - **Breaking change**: developed against githlabhq/master (sqlite no longer supported)

* Gitolite deploy changes via @dscheu
  - Deploy gitlabhq/gitolite, not sitaramc/gitolite

* Add configurable backup paths to Gitlab configuration via @dscheu