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 45 23 pm](https://cloud.githubusercontent.com/assets/1656824/3620126/1179bf84-0dfc-11e4-95b3-babaabdb6889.png)