Merge pull request #1 from JonasKunze/master

Restarted project
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