v2.0.0 * Start introducing composite ObjId in the interface * Remove get_random(), add_stream and get_stream * Remove deprecated 'args' argument of get_objstorage * Remove deprecated alias 'weed' of 'seaweedfs'. * Make add() and restore() return None instead of ObjId * libcloud: Default to gzip compression * Make obj_id argument of ObjStorage.restore() and ObjStorage.add() required * api/server: Fix streaming responses implementation * test maintenance