Fix bug in importing of models
Merge branch 'issue/415' of github.com:globaleaks/GLBackend into issue/415

* 'issue/415' of github.com:globaleaks/GLBackend:
  issue/415 complexity reductions (thanks to vecna suggestions)
  addressed issue https://github.com/globaleaks/GlobaLeaks/issues/482
  fixed issue https://github.com/globaleaks/GlobaLeaks/issues/467

Conflicts:
	globaleaks/handlers/admstaticfiles.py