Add header for additional options, not part of auth types
Add header for additional options, not part of auth types

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