Update PluginsContrib to the latest version

$ git shortlog 7fc37f4..f016d35
Miklos Espak (1):
      XNAT plugin update

Sascha Zelzer (2):
      Merge pull request #1 from espakm/master
      Updated XNAT plug-in to work with changed qRestAPI repo.
Merge branch 'update-plugin-contrib'

* update-plugin-contrib:
  Update PluginsContrib to the latest version