World cup group table tweaks

As requested from UX and editorial

- Remove group name from all fixtures list
- Add group name to table component

/cc @adamnfish 

#### Before
![google chrome](https://cloud.githubusercontent.com/assets/80089/3269361/f04daaa8-f2eb-11e3-8971-947f478dde48.png)

#### After
![google chrome](https://cloud.githubusercontent.com/assets/80089/3269363/f75cc536-f2eb-11e3-844a-90ea63b8bf07.png)


Should this be `Some(competition.fullName)`

`Option(...)` implies that `competition.fullName` could be `null`, in which case I will be having a chat with someone...