Always vendor JDK
Update default play version.

http://www.playframework.com/security/vulnerability/20130806-SessionInjection
Play 1.2.7
Do not detect a brand new Play2.2 project as a Play1 project

Play2.2 switched to the new sbt configuration format and does not provide project/Build.scala by default anymore
Implement test for not detecting play2.2
Merge pull request #25 from baloo/patch-1

Do not detect a brand new Play2.2 project as a Play1 project
Merge changes from heroku upstream

Play update (1.2.4 -> 1.2.7) and a couple of minor changes / fixes.