cleartype default fails with jquery 2.0

[bmacnaughton]

I'm not sure if you care about supporting jquery 2.0 but they dropped support for $.support.opacity (only matters for unsupported browsers) so the various checks of $.support.opacity fail. I'm setting cleartype to false, so I seem to avoid most references to $.support.opacity.

I can take a stab at fixing it if you'd like.