Improves the ability of the SC.browser experimental name testing to succeed by adding a test value that can be used.
Dumbs down the animation support testing slightly, because the latest Chrome Canary appears to support the unprefixed 'animation' style, but you can't actually use it at the moment.  While the SC.browser test has been improved to account for this by being able to pass in a test value, this still fails unless you break execution before running the test.   Instead, we just test both the prefixed and unprefixed versions.