* Add caching support to users/group
* Add a function has_perm that works with the cache.
* Removed our session backend so other session backends (without the database) can be used
Now, only staff users has this permission by default. (Fixed #2004.)
Some more work on users/groups template:
- Added description to permission string to show that only 'present' and
'comment' fields are affected by this permission.
- Allowed to create groups without permissions.
- Fixed showing group names in users lists view for staff and normal users.
- Use ng-cloak for hide template parts while loading.
- Set html lang attribute dynamically (Fixes#1546)
- Clean up: Rename 'dashboard' to 'home'.
- Show duration of speech in minutes. (Fixes#1882)
- Save agenda specific stuff for customslides. (Fixes#1887)
- Remove title from QuickEdit from.
- Checkbox for item.closed is now visible for manager only.
- Agenda list view: Show list of speakers link also for normal users.
- Improve slide templates: Show agenda item number and subtitle.
- Fixed agenda title for motions and assignments.
(Don't load motions and assignmetn in agenda app.)
- Added missing seach template.
Removed form_field attributes.
Added extra fields for HTML rendering like label and help text.
Added fields for sorting and grouping. Removed old collection system.
Added config groups to config view via OPTIONS requests.
Regrouped all variables.
Added validation. Changed internal handling.
Refactored user creation and update via REST API. Used new serializer.
Cleaned up management commands, signals and imports. Moved code from 'api.py' to 'models.py'.
Changed usage of group 'Registered'. Now the users don't have to be members to gain its permissions. Used customized auth backend for this.
Added and changed some tests.
