Fix invalid webmachine callback response
Fix invalid webmachine callback response

AZ885

* Return tuple with rd and ctx instead of just bool
* Appease webmachine with a handler for deletes

sdebnath/riak_cs,basho/riak_cs,yangchengjian/riak_cs,GabrielNicolasAvellaneda/riak_cs,basho/riak_cs,basho/riak_cs_report,yangchengjian/riak_cs,laurenrother/riak_cs,basho/riak_cs_lfs,sdebnath/riak_cs,dragonfax/riak_cs,yangchengjian/riak_cs,sdebnath/riak_cs,yangchengjian/riak_cs,dragonfax/riak_cs,dragonfax/riak_cs,laurenrother/riak_cs,sdebnath/riak_cs,basho/riak_cs,GabrielNicolasAvellaneda/riak_cs,GabrielNicolasAvellaneda/riak_cs,dragonfax/riak_cs,basho/riak_cs,laurenrother/riak_cs,laurenrother/riak_cs,GabrielNicolasAvellaneda/riak_cs