Add tonal colour hints interactive header

Also fixes some spacing issues, fixes comment icons not appearing

Before: 
![screen shot 2014-10-24 at 17 15 19](https://cloud.githubusercontent.com/assets/813383/4772588/c9efee90-5b99-11e4-9085-ffaa15f9bfec.png)

![screen shot 2014-10-24 at 17 15 36](https://cloud.githubusercontent.com/assets/813383/4772592/cec0156c-5b99-11e4-82be-e4d8c1ca1ce4.png)

After:

![screen shot 2014-10-24 at 17 15 08](https://cloud.githubusercontent.com/assets/813383/4772599/d470fd8c-5b99-11e4-8d67-fd99e089b863.png)

![screen shot 2014-10-24 at 17 15 47](https://cloud.githubusercontent.com/assets/813383/4772602/d97762bc-5b99-11e4-9777-c21ba5a2efc0.png)