Merge pull request #1 from JonasKunze/master

Restarted project
Bugfix: Vote.getByFlag did not return NEUTRAL in case of voteFlag==3
added more tests
NodeFactory.clearDataBase implemented
save state for remote debugging
Made closeDB methods idempotent
more tests
Implemented LikeService.nodeExists and renamed UUID to Muid
Merge branch 'master' of github.com:Metalcon/likeButtonServer into feature/tests
API now returns arrays without 0 entries
Bugfix: Some wrong asserts in the tests
Merged test and develop