tidied library and some tiny docs
tidying
some blocks
setting up tests
a bunch of dyadic blocks and their tests; gates and latches
identity, head, and tail
merging in stores
random generators (untested)
moved main back to being a server, updated library with new blocks
changed mod from % to mod
added new blocks to library
Merge pull request #28 from mikedewar/master

stores; new blocks; tests