Ensure large items with sublinks have images at mobile

/cc @sndrs @kungpochicken 

### Before
![google chrome](https://cloud.githubusercontent.com/assets/80089/4580565/4aad916e-4fd7-11e4-9eb0-e09dde342a7f.png)

### After
![google chrome](https://cloud.githubusercontent.com/assets/80089/4580566/4e000360-4fd7-11e4-9d5a-29e7a6cd6978.png)