Update sphinx
Updated Locales. Add HU, NL and RU
Bump converse.js to latest code in master (0.6.6 and a bit)

Specifically: 61c7174238778c12e9457f04dcd6c86ff0096092
Add new langs to js registry and add upgrade step
Bugfix. Roster didn't appear in some cases.

Make sure the last roster item is still added (even if it's a
zombie), so that the roster will be shown (roster is only shown
when last_item property is true).