Fix for #1147, Proxy for audio URL and upgrade hls.js (#1178)
* Revert "Fix broken video playback by forcing fmp4"
This reverts commit 52db03b73ad5f83f67c83ab197ae3b20a2523d39.
* Fix audio url in video m3u8
* Upgrade hls.js to 1.5.1 and use full version