Styling tweaks

Closes #37 

Made some UI/UX improvements per @isaackeyet:

1. Removed the "Visitors and Views" heading on the top of the table ![ios simulator screen shot aug 1 2014 8 02 42 am](https://cloud.githubusercontent.com/assets/373903/3779029/1e78e70a-197d-11e4-88ab-e835b3f16411.png)
1. Allow numbers to shrink to fit in the cells that display large counts ![ios simulator screen shot aug 1 2014 8 02 49 am](https://cloud.githubusercontent.com/assets/373903/3779031/1e7fe532-197d-11e4-953a-25392c60fc70.png)
1. Removed the subheading "Content" in Followers & Shared section ![ios simulator screen shot aug 1 2014 8 02 57 am](https://cloud.githubusercontent.com/assets/373903/3779028/1e78506a-197d-11e4-84bc-9f03f7b1060f.png)
1. Made the column heading under Referrers singular (Referrer instead of Referrers) ![ios simulator screen shot aug 1 2014 8 03 10 am](https://cloud.githubusercontent.com/assets/373903/3779030/1e7ad376-197d-11e4-9b8f-358a4e64d33a.png)