Tweak CSS so really long breadcrumbs wrap nicer

Use display inline instead of floats so that manual sections with really long titles wrap nicely instead of acting as a block.

### Before

![screen shot 2014-08-08 at 11 31 37](https://cloud.githubusercontent.com/assets/74812/3855720/86cf30c2-1ee9-11e4-9e2f-26b1093f8bbf.png)

### After

![screen shot 2014-08-08 at 13 13 40](https://cloud.githubusercontent.com/assets/74812/3856355/78287306-1ef5-11e4-99f0-206c726df0ab.png)