Fixing padding and margin so widths of all commercial items are all equal

This fixes an issue where the items were different widths meaning that the images were larger in the first and last item in a commercial component list. It manifests itself because the first and last image are then larger.

Before;
![screen shot 2014-12-11 at 14 40 49](https://cloud.githubusercontent.com/assets/1303616/5395724/d5df9550-8143-11e4-9970-e9005e207dd6.png)

After;
![screen shot 2014-12-11 at 14 40 56](https://cloud.githubusercontent.com/assets/1303616/5395730/e0a470be-8143-11e4-8f97-ba2c782e7887.png)