Bug 835007:  Make 'transition-property: all' work as an item within a list.  r=bzbarsky

No changes to the transition manager are needed since
nsTransitionManager::StyleContextChanged already makes the appropriate
calls to ConsiderStartingTransition for 'all', and that existing code
should work fine within a loop (just like the existing code to handle
shorthands or other property duplication works).
Bug 765599:  Make CSS insertRule methods throw SYNTAX_ERR when given an empty rule or more than one rule.  r=bzbarsky

This implements the proposed spec clarification in
http://lists.w3.org/Archives/Public/www-style/2013Feb/0229.html which
makes us compatible with WebKit on the insertRule tests in this patch.

I confirmed that the test reports 7 failures without the patch, but
passes with the patch.  (I'm a little disturbed by the way our
testharness.js integration elides runs of successive passes.)