[Bug 842783] Update vendor for Django 1.4.4
Merge pull request #402 from Sancus/master

upgrade django to 1.4.4
Merge pull request #399 from glogiotatidis/admin-filter

Filter Superusers in Admin Interface.
[fix bug 842293] Allow filtering of incomplete profiles in Admin panel.
[fix bug 809481] Do not use hash when username is taken.
[fix bug 842292]  Handle incomplete profiles.

Don't index in ES incomplete profiles.
Don't list incomplete profiles in groups.
Don't show profile of incomplete profiles.