bugfixes
- abr-controller: fix under-estimated bandwidth estimation in case config.startFragPrefetch is used
- There is only the sound but no picture #850 (correctly parse keyframe embedded in NDR NAL unit)
- get rid of TypedArray.prototype.slice() polyfill and fix silent audio frame injection on IE11
- Modify regex to capture fragment durations without a leading zero #861
- buffer-controller: catch harmless exceptions
- Release MediaSource object URL when media is detached (memleak) #863
- Pushing fix for CC cues not stopping when switching media #864