Starting partners_dashboard
Improve UX for Partner dashboard

- Removed detail view
- Moved Create button to top
- Moved Reset filtering button next to Search button
- Added success messages to update and delete views
Allow managing users in partner dashboard.
Tidy templates

- Use conventional breadcrumbs and titles
- Simplify a few things
Change URLs for partner dashboard

Plus change URL names to try and be as conventional as possible.
Consolidate naming conventions

Use Django conventions for:

- View class names
- app.py view attribute names
- template names
Refactor partner dashboard views

- Merged PartnerUpdate and PartnerUserList view for a better UX
- Created new ExistingUserForm to allow for updating user details
  without changing password
- PartnerUserUpdateView now enforces user being associated to partner
- Added Undo link when unlinking user
- Enrich user details when creating in form instead of view
Small tweaks to partner dashboard

- Correct breadcrumbs
- Use {{ form.is_bound }} where appropriate
- Rearrange forms on partner detail page
- Add help text to forms
Merge pull request #653
Fix fixtures for import tests