WIP: CFD-134 - Changing group permission

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

those 3 lines should be changed to a multi-step, so it's easier to read - and not a script.
for example:

```behat
Given I am logged in as user "turing"
When I create a new group "Some title"
Then ...
```