Address various groups TODOs and small bug fixes

* Style the group name edit dialog with standard min
  width style.  Also restrict names to be a single
  line and add a hint to the EditText.  Finally,
  bring up the keyboard when the dialog is first created.
* Change the "edit" group menu option name to "rename",
  remove the icon, and keep it under the overflow.
* Sort groups consistently on the main list and contact
  editor spinnner.
* Don't load deleted groups. We don't need to  handle
  deleted groups in the members loader because the metadata
  loader omits them in the selection clause.
* Show a toast after deleting a group.  Also don't prompt
  for confirmation when deleting if the group is empty.
* Remove some unnecessary header binding in the group member
  list adapter.

Bug 28955365
Bug 28936603
Bug 18641067

Change-Id: Icec1e1d3bbafb7e1e94a7e841860836d256177f1