Add pause handling to start batch command
Add pause handling to start batch command

Also add some error returns

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