commit siwka
branch siwka
user profile model
registration urls
registration/login/logout views
Add header height and new style for errorlist
Add import for decorators
Add new template - login
Fix issue with coding
Add login form to base template
Merge remote-tracking branch 'origin/siwekm' into nazarewk

Conflicts:
	conferences/conferences/models.py
	conferences/conferences/urls.py
	conferences/conferences/views.py
	conferences/media/style.css
	conferences/templates/conferences/base.html
more refactoring