Fixed the FirefoxOS slider knob highlighting, and took into account the FirefoxOS Simulator which frustratingly does support :active:hover css selector
Changed the :active:hover workaround for FirefoxOS to be more rebust and far more closely appear like the css selector.
Merge pull request #141 from JayCanuck/master

 Fixed the FirefoxOS slider knob highlighting, and took into account the FirefoxOS Simulator which frustratingly does support :active:hover css selector

Reviewed-By: Ben Combee (ben.combee@palm.com)