Merge pull request #597 from glogiotatidis/browserid

[fix bug 910606] Display logo and site name in Persona login.
Merge pull request #584 from glogiotatidis/904826

[fix bug 904862] Use IntegerField in SearchForm.
Merge pull request #590 from glogiotatidis/908673

[fix bug 908673] Display username on public pages when display_name is private.
Merge pull request #593 from glogiotatidis/837787

[fix bug 909333] Logout from Persona when visiting logout view.
Schema migration for PrivacyField.
[fix bug 908236] Add 'title' profile field.