update docs to refer to final release 4
update docs to refer to final release 4
mikfreedman/cf-riak-cs-release,cloudfoundry/cf-riak-cs-release,cloudfoundry/cf-riak-cs-release,datianshi/cf-riak-cs-release,cloudfoundry/cf-riak-cs-release,mikfreedman/cf-riak-cs-release,mikfreedman/cf-riak-cs-release,datianshi/cf-riak-cs-release,datianshi/cf-riak-cs-release,mikfreedman/cf-riak-cs-release,cloudfoundry/cf-riak-cs-release,datianshi/cf-riak-cs-release