GitLab

- minor css fixes
- invitations 2 cols layout
- locally served html5shim
- new form error styles

- created one column full width base template
- applied new styles to logged_out and sign up complete templates

Conflicts:
	astakos/im/context_processors.py
	astakos/im/templates/account_base.html
	astakos/im/templates/invitations.html
	astakos/im/templates/registration/password_change_form.html
	astakos/im/views.py

* move login and setting cookie in one place (prepare_response)
* delete cookie in logout
* delete unused imports
* change requires_anonymous to redirect to logout with next

* change visible fields in user profile page
* change visible fields in user modification administrator page
* enable administrator to update user quota
* read default user level from settings
* show sent invitations and status in user invite page
* if no next request parameter after login redirect to index page
* after successful login set cookie (read cookie name & domain from settings)
* delete cookie in logout
* rename `dummy` target to `redirect` and change its functionality

Refs: #1918

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

Refs: #1935 

Refs: #1913

Refs: #1914
Refs: #1912