Merge pull request #13 from jlmcdonald/master

Exposes the setVolume, mute, and unMute methods of the underlying iFrame API
Updated the JSDoc of the volume methods slightly.
Merge pull request #14 from GoogleWebComponents/v0.0.8

Updated the JSDoc of the volume methods slightly.
Added the playsupported attribute

There’s some logic to determine if we’re on a platform that supports
programmatic playback, and reflect that in the attribute.
Changes to playsupported detection.
Cleaned up some comments.
Bump version to 0.0.9.
Cache playsupported in localStorage after detecting it.
Merge pull request #17 from GoogleWebComponents/playsupported

Added the playsupported attribute
Escape `<video>` in the JSDoc
Merge pull request #1 from GoogleWebComponents/master

Rebase from latest version from original