Implement getMatchedSelectors and filter computedview styles.

This implements the todoMethod getMatchedSelectors so that it's
possible to expand the computed style properties.
Also refactors the getComputed method so that it doesn't always
return all the computed styles, but only those which actually
apply.
Implement getOriginalLocation to make the computed view work on chrome
Merge pull request #84 from captainbrosset/computed-view-fixes

Implement getMatchedSelectors and filter computedview styles.