Add group name to world cup fixtures list

#### Before
![google chrome](https://cloud.githubusercontent.com/assets/80089/3243748/4484570a-f15e-11e3-81e9-88a4c557828c.png)

#### After
![google chrome](https://cloud.githubusercontent.com/assets/80089/3243750/494a7ee0-f15e-11e3-8d81-e5005a802e6b.png)


/cc @adamnfish @gklopper