Ready: Strong consistency update

- [x] Configs in `advanced.config`
- [x] `riak-admin` interface for ensemble
- [x] Implementation details

Heads up to @andrewjstone, @engelsanchez, and @jtuple when he's back.
This may sound crazy, but in order to not scare our customers I'd recommending using 5 and 7 nodes for the example rather than 7 or 9. Feel free to ignore me as well ;)