Standalone styles for the simplified search implementation

I've added a `simple-search.scss` file that includes the standalone styles for the search bar. The template markup is in the `simpleSearch` directive.

![screen shot 2014-07-21 at 12 33 56](https://cloud.githubusercontent.com/assets/47144/3642496/9617b0d4-10c2-11e4-9b4e-42fc381bf3bb.png)

One addition I've added is a "blurred" state that should be used when the search term is inactive and the input is not focussed. We'll need to hook this up in the directive. But to enable it you just add a class of `simple-search-inactive` to the `<form>` element. The result is similar to the last version, but it retails a light grey outline to indicate that it's still there.

![screen shot 2014-07-21 at 12 34 17](https://cloud.githubusercontent.com/assets/47144/3642495/960f220c-10c2-11e4-8d42-da66cdcb26ea.png)