Tweak README.
Use package recipe from the Riak CS cookbook to ensure that
riak_cs_kv_multi_backend is installed before Riak is started.
Bump Riak CS cookbook to v2.2.1.
Bump Riak cookbook to v2.3.2.
Merge pull request #28 from basho/hc-remove-hack

Ensure riak_cs_kv_multi_backend is installed before starting Riak.