Opera 12: Don't assume window is the global object

This fixes imgur expandos due to Opera's weird with() propagation
causing jQuery version conflicts.
Opera 12: Refer to window.Pasteurizer directly

HTMLPasteurizer.js installs itself into window.Pasteurizer,
so this conflicted with the var declaration in
reddit_enhancement_suite.user.js.

This fixes Imgur album expandos.
Opera 12: Update CSS list

Fixes "Tips and Tricks" style and possibly something Dashboard related.