fix typography for listing headers

- Line-height and font-size change for [detail page (mock)](https://bug929805.bugzilla.mozilla.org/attachment.cgi?id=822464) and [listing page (mock)](https://bug929805.bugzilla.mozilla.org/attachment.cgi?id=822461).
- basta-breaks

**Detail page mobile**
![screen shot 2013-11-14 at 3 36 55 pm](https://f.cloud.github.com/assets/674727/1546441/b58767f8-4d85-11e3-95de-f23cf3a47252.png)


**Detail page desktop**
![screen shot 2013-11-14 at 3 36 51 pm](https://f.cloud.github.com/assets/674727/1546442/b7818b10-4d85-11e3-9943-9c612d170d33.png)


**Listing page mobile**
![screen shot 2013-11-14 at 3 36 33 pm](https://f.cloud.github.com/assets/674727/1546439/aef4afea-4d85-11e3-9a69-78c06e174b63.png)


**Listing page desktop**
![screen shot 2013-11-14 at 3 36 42 pm](https://f.cloud.github.com/assets/674727/1546440/b35e4294-4d85-11e3-9f12-a9ad4afbebe1.png)