Fix ConversionService
Merge pull request #825 from erwinwinder/master

Fix ConversionService
Issue #2132
- System entity's can be generated for super user.
- There are security tests generated for EntityService's 
- Menu labels for MolgenisUser, MolgenisGroup, MolgenisGroupMember under
entities label.
- Bug fix fixed generated form couldn't be edited.
- Bug fix fixed static AUTHORITY_ENTITY_WRITE_PREFIX was not correct.
Merge pull request #826 from jjettenn/master

Issue #2132
Bug fix: update link to data explorer plugin
Merge branch 'master' of https://github.com/molgenis/molgenis
Bug fix: re-introduce permission manager plugin
Merge pull request #827 from dennishendriksen/master

Bug fix: update link to data explorer plugin
Update README.md
Merge branch 'master' of github.com:molgenis/molgenis