- use traits for nodes to reduce duplicate code
- fix directory seperators in file node hashes
- use node objects to locate file nodes in result (to use correct hashes)
activate job queue bundle
set latest build version
remove php 5.3 from travis config / add php 5.4.4 (debian wheezy)
remove php 5.4.4 (it is not existing at travis)
Merge pull request #12 from temp/feature/queue

Activate job queue
Merge pull request #13 from pl-github/dev

Fix windows path problem
Merge remote-tracking branch 'origin/dev' into feature/repository

Conflicts:
	src/Classroom/ProjectBundle/Command/CreateRevisionCommand.php