2013-03-17-11.19.53: src/lib/src/queue.api:  For consistency renamed   push_item_into_back_of_queue -> put_on_back_of_queue,   pull_item_from_front_of_queue -> take_from_front_of_queue,   unpull_item_into_front_of_queue -> put_on_front_of_queue,   unpush_item_from_back_of_queue -> take_from_back_of_queue.