Merge pull request #1542 from dennishendriksen/master

Add middle names to user account plugin + cleanup
Cannot have compound key as single unique key
Added AttributeClass examples
Merge pull request #1543 from erwinwinder/master

Model registry
update RTP genomebrowser and filter wizard
Merge pull request #1546 from bartcharbon/master

update RTP genomebrowser and filter wizard
Show complex filter operator only when more then one input fields exist.
Hide complex filter operator when one input field exists.
Merge branch 'master' of github.com:molgenis/molgenis
Merge pull request #1549 from jjettenn/master

Complex filters: Show complex filter operator only when more then one input fields exist