WIP: CFD-134 - Changing group permission

#156 
WIP
![selection_382](https://cloud.githubusercontent.com/assets/99186/4842556/cf25e086-6026-11e4-8afd-607ed72781f7.png)

Or maybe something like this:

```
Given a group "My bad hair day new group" with "public" access is created
When I am logged in as user "isaacnewton"
And I visit "My bad hair day new group" of type "group"
Then I should get a "200" HTTP response
```