fixes streamCompleted detection for SegmentTimeline videos
fixes buffering and scheduling issues
Merge pull request #157 from MSOpenTech/development

fixes for completion, buffering and scheduling
sets lower limit for minimumUpdatePeriod
fixes segment appending order during quality switching
fixes appending init segments during quality switching
fixes the use of SourceBuffer.updateend event listener
fixes setting buffer.timestampOffset
Merge pull request #158 from MSOpenTech/development

Improve segment appends
fixes availability window updates
Merge pull request #161 from MSOpenTech/dynamic-support

fixes availability window updates