Add bucket_type property/attribute to RiakBucket class
Add bucket_type property/attribute to RiakBucket class

GabrielNicolasAvellaneda/riak-python-client,GabrielNicolasAvellaneda/riak-python-client,basho/riak-python-client,bmess/riak-python-client,basho/riak-python-client,bmess/riak-python-client,basho/riak-python-client