Added login header link
Merge branch 'master' of github.com:joerivandervelde/molgenis_apps
Updated wormqtl install guides
Added missing build step to wormqtl
Update for test, now null is returned instead of empty string
Merge branch 'testing' of github.com:molgenis/molgenis_apps
Merge pull request #412 from joerivandervelde/master

Updates for QTL apps and updated test