Make `ring_creation_size` setting for riak_core more obvious and available
Make `ring_creation_size` setting for riak_core more obvious and available

Fixes #139

biddyweb/riak,DavidAlphaFox/riak,GabrielNicolasAvellaneda/riak,authbox-lib/riak,basho/riak,yangchengjian/riak,laurenrother/riak,glickbot/riak,amyvmiwei/riak,xuejianhai/riak,elkingtonmcb/riak