Use my github repo when cloning cloudformation-riak.
This will eventually be reverted
Stop passing around the riak_ips array since it's not used anywhere
We can reduce network calls and code if we pass the instance instead
of instance_id into get_reservation_info and get_autoscale_info
Remove code that should have been removed when the returning of riak_ips
was removed
Sort instances by id then time instead of ip address to ensure that
the last nodes are always the ones that are coming up, and that the
node that is hosting the join is already part of the cluster