Add <style /> tag support

[bnolan]

Once #13 is done, it'd be nice to be able to style elements using css selectors. @hayes has posted some sample code that shows how to use cssauron with dom-lite to apply styles.

litejs/dom#13 (comment)

The styles should be reapplied anytime a dom node has a significant change (not on position, rotation or scale change). The styles should be set as inline styles, so they are reflected down to the client. The client shouldn't receive the <style /> tags (the same way script tags aren't reflected).