#2150
Merge branch 'master' of github.com:molgenis/molgenis
Merge branch 'master' of github.com:molgenis/molgenis
Merge branch 'master' of github.com:molgenis/molgenis
Merge pull request #933 from jjettenn/master

#2150
Merge pull request #934 from dennishendriksen/feature/studydefinitionservice

DataService and Query interface changes + use study definition service
Merge pull request #935 from dennishendriksen/feature/studydefinitionservice

Fix Query constructors
Implement hashcode and equals
Merge pull request #937 from erwinwinder/master

Implement hashcode and equals
Merge branch 'master' of https://github.com/molgenis/molgenis into feature/studydefinitionservice