Usergrid 1729 put groups bug

There was a bug report that said "When trying to update an entity in /groups, the API returns a "required_property_not_found" error when using the /path property of the group entity as the endpoint, if /path is the same as the application name. If the UUID of the group is used instead of the path, then the request is successful."

This bug appears to have been fixed somewhere along the way and this PR provides a test that proves it, a test that tests updating a group but HTTP PUT using both a path URL and a UUID URL.

(there are also so minor formatting and licensing header fixes)