Merge branch 'master' of github.com:tobiasmuecksch/backend
Merge remote-tracking branch 'upstream/master'
Merge remote-tracking branch 'upstream/master'
Merge remote-tracking branch 'upstream/master'
Merge remote-tracking branch 'upstream/master'
Merge remote-tracking branch 'upstream/master'
Define dependency versions

in order to prevent any migration problems with future versions of the dependencies
Merge pull request #26 from tobiasmuecksch/master

Define dependency versions