Unprefixing ALL THE THINGS

Removing ```webkit-``` prefixed calls to ```createShadowRoot```, thanks to using a "monkey patch" polyfill that I just wrote. If you think it'd be better to just inline the patching into the example, it can be done too, but I thought it would be cleaner to leave that aside.

Now the two first examples work with Firefox Nightly (20140102) and Chrome.

Not sure why the last example doesn't work (in any browser), seems to be a "feature" of the code :wink: