Unify spacing and top border between slices

I target to release this in the morning, in time for Patrick S' presentation.

A quick code review would be appreciated :)

- [fix] Two fromage container in a row now have a border between them
- [fix] Show top border of items only when necessary
- [fix #4331] Image width - inconsistent in news container - network front

## Before

![screen shot 2014-05-28 at 18 54 44](https://cloud.githubusercontent.com/assets/85783/3108767/af79697c-e693-11e3-8d74-fa429e630ae9.PNG)

![screen shot 2014-05-28 at 18 54 23](https://cloud.githubusercontent.com/assets/85783/3108770/b1e85b82-e693-11e3-905f-188d77aed466.PNG)


## After

![screen shot 2014-05-28 at 18 53 42](https://cloud.githubusercontent.com/assets/85783/3108776/b9be1e46-e693-11e3-9849-b085be0fc107.PNG)

![screen shot 2014-05-28 at 18 54 02](https://cloud.githubusercontent.com/assets/85783/3108772/b61417e6-e693-11e3-8b40-a08b59de877a.PNG)

![image](https://cloud.githubusercontent.com/assets/85783/3108788/c953138e-e693-11e3-95a9-4ce26b87cdb8.png)

![face-wash](https://cloud.githubusercontent.com/assets/85783/3108791/ce73fe82-e693-11e3-93dc-89bab2276f91.gif)