smaller h1s

@ossreleasefeed r?

I thought those `h1`s were screaming for too much attention. 
![screenshot 2014-10-16 10 44 53](https://cloud.githubusercontent.com/assets/26739/4667372/30a4ccee-555c-11e4-8c41-164aae0b9e52.png)
48px seems a better size.