CFD-235 : Create Group : PURL path should be separated by dashes not underscores

#255 

![selection_033](https://cloud.githubusercontent.com/assets/7369740/5523362/38ad53ea-89d0-11e4-8589-167d3b3c7e16.png)


![selection_034](https://cloud.githubusercontent.com/assets/7369740/5523363/3b821de4-89d0-11e4-88a3-9d5e9979f117.png)

@amitaibu This PR is ready for code review.