size the search box to be the same size as the search results; exclude r...

Search improvements:

- ignore 'derived' resources in the search results. this includes things from the `build/` directory
- size the search results to be as wide as the search box, and to appear directly under it

![screen shot 2014-03-02 at 2 26 59 am](https://f.cloud.github.com/assets/1269969/2312065/518f8ede-a2f7-11e3-9e7f-35634c266c2b.png)

@ussuri