Jd textstyles again

Just some tightening up of certain styles from the last few months.

1.) Simplified Typography hierachy

![image](https://cloud.githubusercontent.com/assets/1341391/5378407/e495710e-8081-11e4-84d2-190819e78e31.png)

2.) Subnavigation redux

![image](https://cloud.githubusercontent.com/assets/1341391/5378413/f0e92446-8081-11e4-8a2c-3f1318442dda.png)

3.) Body copy alterations

![image](https://cloud.githubusercontent.com/assets/1341391/5378439/26cfabde-8082-11e4-986e-674c58c65fd3.png)

4.) Some style guide template cleanup

![image](https://cloud.githubusercontent.com/assets/1341391/5378456/39c96dc4-8082-11e4-95e1-50095d0b64a6.png)

5.) Left navigation clean up; less loud active state

![image](https://cloud.githubusercontent.com/assets/1341391/5378468/4a2b7572-8082-11e4-9e69-c0f88396c3ba.png)
This should be `+font-size(13)`