Treat sublinks on mobile as on tablet+

- places hard limits on sub links on a per-item type basis
- includes quick fix for items which break down to media lists on mobile

![screen shot 2014-10-16 at 13 36 06](https://cloud.githubusercontent.com/assets/867233/4662421/0326c644-5531-11e4-8191-d3a0a889841a.png)

![screen shot 2014-10-16 at 13 36 40](https://cloud.githubusercontent.com/assets/867233/4662422/072abbce-5531-11e4-986e-d6916df9f046.png)