Merge branch 'develop' of http://github.com/mytardis/mytardis into de…

…velop

* 'develop' of http://github.com/mytardis/mytardis:
  Correct use of Form.is_valid() (should be method call).

tardis/tardis_portal/views/authorisation.py

@@ -462,7 +462,7 @@ def change_user_permissions(request, experiment_id, username):
     if request.method == 'POST':
         form = ChangeUserPermissionsForm(request.POST, instance=acl)
 
-        if form.is_valid:
+        if form.is_valid():
             if 'isOwner' in form.changed_data and \
                             form.cleaned_data['isOwner'] is False and \
                             len(owner_acls) == 1: