GitLab

change until get_or_create_user signature: remove username argument parameter and email should be obligatory 

Refs: #1935 

-incorporate CsrfViewMiddleware
-change tamplates to render forms
-change email template location
-api.activate() returns only information about token
- In prepare_response, instead of setting the cookie, log the user in
- use django.contrib.auth.views for reseting and changing user password

Ref: #1874

- extend django user model
- pass template_name and extra_context in views
- incorporate context processors
- use different backends for invitations and simple workflow

Refs: #1823