webui: suppress a django warning
webui: suppress a django warning

RemovedInDjango19Warning: Default value of 'RedirectView.permanent' will change from True to False in Django 1.9. Set an explicit value to silence this warning.

Former-commit-id: af69b73d43fc3ee64a3b2f9e0e0cda7b94a4e7fd
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine