Adjust heading levels and style changes

Closes #217, #402 

* Added changes specified in #217 
* Modified/added tests to reflect changes
* Adjusted styles to main elements like facets, top menu bar etc. to match @jvine 's visual design

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![image](https://cloud.githubusercontent.com/assets/302258/3474873/7e39d028-02e9-11e4-959d-4d0221281e35.png)
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![image](https://cloud.githubusercontent.com/assets/302258/3474892/a2b47fde-02e9-11e4-98e0-a448f2a5cf8f.png)
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![image](https://cloud.githubusercontent.com/assets/302258/3474902/d2a9ca00-02e9-11e4-9b69-92ad922aa1c8.png)


Also should we go ahead and style this since we are touching the heading styles?

![screen shot 2014-07-03 at 4 57 05 pm](https://cloud.githubusercontent.com/assets/1656824/3475787/d8e8c8e8-02f4-11e4-9abd-e0d4c48ef606.png)