Added group CRUD

![](http://media.giphy.com/media/eWiDddqZn1lkc/giphy.gif)

## Screenshots
### Create a new group
![2014-09-28-023002_1366x768_scrot](https://cloud.githubusercontent.com/assets/748971/4432682/aa77658c-46a6-11e4-8242-fcd2f6feb1b9.png)
### Group page
![2014-09-28-021556_1366x768_scrot](https://cloud.githubusercontent.com/assets/748971/4432653/d959c68a-46a4-11e4-8b38-3bb6daffdf53.png)
### Group settings
![2014-09-28-021623_1366x768_scrot](https://cloud.githubusercontent.com/assets/748971/4432654/e1670bf8-46a4-11e4-9faf-5af62f66c173.png)
### Destroy group confirmation modal
![2014-09-28-021637_1366x768_scrot](https://cloud.githubusercontent.com/assets/748971/4432655/e96cb226-46a4-11e4-8463-fa8ec6f7ebca.png)