Default to `fold_objects_for_list_keys` true
Default to `fold_objects_for_list_keys` true

Fixes #737

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