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Refs: #1993

Refs: #1993

Refs: #1918

- fix user profile editing bug
- fix user activation issue
- consume invitation upon invited user creation
- fix invited user invitations
- add token info in test user fixture
- minor bug fixes

Refs: #1917
Refs: #1911
Refs: #1919

- create im/migrations (for south use)
- fixture for django_site
- fix ExtendedUserCreationForm: use AstakosUser instead of django.contrib.auth.models.User
- do not redirect to profile page after login if request.user is superuser

-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