Since the old-Webkit Adjacent/General Sibling bug seems to affect eve…

…n new Android devices, with Android versions up to 4.2, the conditional
media query that targets them needs to be expanded.

This fixes support for devices like the Galaxy S2, S3, HTC Incredible S,
that ship with Android 4.0, and probably many others.
This also changes the animated property to use a webkit-only
`translate3d`, fixing performance issues on desktop Chrome, even if the
mediaquery is somehow triggered on very small windows.