ticket:5 added authorization test which shouldn't pass
ticket:5 added avatar field and Pillow requirement
ticket:5 made migrations for new field
ticket:5 edited view, urls, settings, requirements (PIllow and widget_tweaks) added form and image for no avatar
ticket:5 added login template and url, corrected tests (!200 to 302)
ticket:5 fixed views, added new test and made cosmetical editions to forms, models and css