Add perspective and perspective-origin support
Add test for perspective
Add test for perspective-origin
Lint fixes
Updated test failure expectations
Remove unnecessary magic
Merge pull request #580 from alancutter/supportPerspective

Add support for perspective and perspective-origin
Updated player.currentTime to new spec
Remove player.timeLag
Bring back player playground
Update updating player paused state
Update player seeking
Update updating player start time
Add setting playback rate controls to playground
Add unlimited current time monitoring to playground
Make player._sourceContentEnd a property
Fix spec bug; update hold time on read current time
Fix spec bug; always update stored value for adjusted start time on player seek
Fix spec bug; use the hold time in calculating the new adjusted start time when the player becomes unlimited
Ensure setting the player's current time causes the previously calculated current time to be updated as well