The `ms` & `moz` prefixes are not needed. `ms` was never available in a public
IE release (IE 10 has an unprefixed version) and Firefox has unprefixed
rAF since v24 - current version is 41. Even more, Firefox versions below 22
don't have cancelAnimationFrame so it's better to not use the prefixed version
at all to avoid surprises.
The `o` prefix is also useless - Opera Presto never had rAF and the
Chromium-based Opera doesn't use the `o` prefix.
Also, switched from `new Date().getTime()` to `Date.now()` as it's supported
everywhere (even in Android 2.3) except IE<9 and it avoids a useless date
object construction.
See http://caniuse.com/#feat=requestanimationframe for more info.
Refs 4f56a01b3b9ac7edf8ebaa1e86425808920c2370
Closes#4394
9679fc94f6