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 but if you set ```dom.webcomponents.enabled``` in ```about:config```) and Chrome.

Not sure why the last example doesn't work (in any browser), seems to be a "feature" of the code :wink: