Check for bucket names that are binaries when listing buckets.
Check for bucket names that are binaries when listing buckets.

Fixes MOSS239

Address an incompatability from the 1.0 branch where bucket names were
stored in user records as binaries, but have since been changed to be
stored as strings. Change the list_all_my_buckets_response function to
allow for bucket names to be binaries as well as strings.

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