Search toolbar styling updates

Updates search bar styling to come inline with viz design. Depends on https://github.com/sul-dlss/SearchWorks/pull/418

Fixes #367 
Also address #348 

![screen shot 2014-07-08 at 10 36 10 am](https://cloud.githubusercontent.com/assets/1656824/3513840/9659dc44-06c6-11e4-8e0a-472080e9eadf.png)

![screen shot 2014-07-08 at 10 38 41 am](https://cloud.githubusercontent.com/assets/1656824/3513919/655a5b36-06c7-11e4-9440-211004e52141.png)

![screen shot 2014-07-08 at 10 38 49 am](https://cloud.githubusercontent.com/assets/1656824/3513923/69f0304e-06c7-11e4-9dae-9fb1a3e439ca.png)