bugfixes

Player freezes when autoLevelCapping exceeds available levels #672 #673
Do not try to merge fragment details when the playlist is empty for live #678
Ad not playing back #681
buffer-controller: flush any waiting segments on MEDIA_DETACHING (fix loop of media decode error on audio codec switch)
Green artifacts when using hls.js on latest Chrome Mac OS X #676
Issues decoding BipBop by Apple #600
Flickering/slow playback #516
Can't enable logging in worker #692

enhancement