0.01    2015-03-22
        Igor Tsigankov     First version. Following methods implemented:
                           create_user
                           delete_user
                           get_user
                           update_user
                           add_user_to_group
                           remove_user_from_group
                           create_group
                           get_group
                           delete_group
                           create_policy
                           get_policy
                           delete_policy
                           put_user_policy
                           get_user_policy
                           delete_user_policy
                           create_access_key
                           delete_access_key
                           list_access_keys