Updated the get functionality to use all of the sort parameters instead of just using the get list call.
Added in the basic functionality to update an existing group.  You can only edit the properties for now, going to add the persons and other items shortly.

I also fixed an issue where the id wasn't being generated when creating a new group and the id was being set to 0, so if you tried to create a new one it was failing.  It's now generating a UUID.