Support SmoothStreaming repeated chunk tags.
Enhance parsing of xs:duration to support year/month/day.
Fix timestamp rollover issue for DASH live.

The timestamp scaling in SegmentBase.getSegmentTimeUs was
overflowing for some streams. Apply a similar trick to that
applied in the SmoothStreaming case to fix it.
Add VSYNC aligning smooth frame release helper.
Merge pull request #176 from google/dev

dev -> dev-hls