Add concurrency to channel saving on server shutdown

Merge pull request calzoneman#613 from calzoneman/videojs-hls

Add HLS support (and upgrade Video.JS)

Merge pull request calzoneman#604 from Xaekai/phoning.it.in

Prevent rendering of <iframes> and <objects> in the error message …

Fix calzoneman#548

ffmpeg: follow relative redirects

v2.3.1 (client only)

- Add a nice menu to userlist dropdowns for easily changing ranks
- Merge give/take leader into one button
- Move playlist lock button to the same button strip as voteskip/get playlist urls
- Add a volume slider for Soundcloud

Update version number

Minor fixes for v2.2

- If NO_WEBSOCKETS or USEROPTS.altsocket are true, don't use websockets
- Base resizing on an invisible div (some channels remove/hide #queue)
- Names are properly italicized when AFK