Small errors

Removed a dangling comma which created an error in IE8.
Moved usage of `Uint8Array` of `flv-tag.js` into `hls.FlvTag`. This makes it so that we can abort initialization of the hls plugin if `Uint8Array` isn't available since we're not polyfilling it or using a fallback.

Also, forgot the update local master before branching which is why there is a merge commit.