create device Response Model and changed the service descriptor to return the Device Model instead of the Entity model .
removed used method in usergrid.
Merge branch 'master' of https://github.com/apps4u/incubator-usergrid

# By Apps4u
# Via Apps4u
* 'master' of https://github.com/apps4u/incubator-usergrid:
  added one more example to users example to show how to get a nested values from the results agin using PHP Collection methods