Add aggregation query to find most recent deploys for a project

 - Due to mongo aggregation framework limitations, added a new string representation of the UUID
 - Add migration code to create new UUID fields
Create dashboard, fix tests
Add some docs and release notes
Merge branch 'master' into last-deployed-build

Conflicts:
	riff-raff/app/persistence/mapping.scala
	riff-raff/app/views/test/uuidList.scala.html
Merge pull request #65 from guardian/last-deployed-build

Last deployed build