4 commits

Author	SHA1	Message	Date
Nathan Marz	f5c5284ae1	add docstrings to zippers	2016-04-25 17:47:10 -04:00
Nathan Marz	9a3a19bb9b	add NODE-SEQ, find-first, and NEXT-WALK	2016-04-24 16:49:45 -04:00
Nathan Marz	96d5e94a5b	fix zipper navigation to stop navigating when right/left/up/down/next navigate nowhere	2016-04-24 13:03:29 -04:00
Nathan Marz	70523ac38f	add zipper tests	2016-04-24 11:03:52 -04:00