Added return_none option to cloud files store_object() method.
Added return_none option to cloud files store_object() method.

naemono/pyrax,mandx/pyrax,vikomall/pyrax,0dataloss/pyrax,pratikmallya/pyrax,opsdisk/pyrax,ddaeschler/pyrax,sivel/pyrax,rackspace/pyrax,rackerlabs/heat-pyrax,EdLeafe/pyrax,roelvv/pyrax,briancurtin/pyrax