Fix facia IE bugs

- Ensure `.l-list` items display full width on IE9
- Ensure `.l-row__item--span-3` takes up correct width on IE9
- Fix float collapsing issue with `.l-list` on IE10

### Before
![littlesnapper](https://cloud.githubusercontent.com/assets/80089/4358415/1dba8a88-426a-11e4-981f-70efb5834168.jpg)

### After
![littlesnapper 2](https://cloud.githubusercontent.com/assets/80089/4358417/22c3b77a-426a-11e4-8416-beb704f46553.jpg)

/cc @sndrs