Updated Django version into requirements.txt
Added django-browserid in requirements.txt
Integrated django-browserid

Added support for authentication with Persona (browserid) and we can
also use /admin to use Django Admin.
Group links by user

With the broweserid authentication was necessary change link's
visibilty, now links are only visible to his owner.
Added --user-id option to import_bookmarks command
Merge pull request #6 from pabluk/feature-browserid-support

BrowserId protocol