Merge pull request #213 from MSOpenTech/dynamic-support

Fixes players misinterpretation of Period@start. Adds maniest update chart to index.html
Update 1.2.0 release notes
switch to default to dash.all.js
manually update dash.*.js
Merge pull request #215 from MSOpenTech/dynamic-support

fix index usage
makes the availability time for static mpds relative to the start of the mpd instead of the start of the period