styles access points

Fixes #442 

I opted to add the `#masthead-container` div in the individual masthead containers rather than once in `searchworks.html.erb` so that we weren't rendering another empty div on most pages.

![screen shot 2014-07-17 at 5 49 06 pm](https://cloud.githubusercontent.com/assets/1656824/3620144/34b2e12e-0dfc-11e4-9aa0-c89bbc1a543f.png)