Fix stop-server, so it works with http-kit.
Add new util func to list attributes of database.
Add initialization of database, in case we don't have one yet.

This is probably going to change, since it's all hard-coded.
Looping messaging seems to be working.

Needs massive cleanup and hooks to the Datomic report queue.
Working Datomic transaction polling with websockets.
Clean up 'send' logic, only pull txns once per loop.

No matter how many connections there are.
Black canvas with simple grid set up.
Updates to Datomic now color the canvas red.
Pseudo-animate grayscale grid colors with js timer.