Add prismatic/schema & cljx

Untested
Create ji.service.game
Undo schema integration temporarily

schema version needs to be upgraded, however no internet access at the moment.
Move board update logic to shared namespace
Rename: max-clients? => accepting-clients?

For consistency with service
Rearrange game-id generation
Update ji.service.templates
Use rident to generate better game names, disable auto-join
Upgrade cljs deps
Upgrade/fix more dependencies

Upgrade core.async to latest alpha. It appears that there is now a problem with
using dommy's node macro inside of a go block. Probably an order-of-operations
problem? Fixed compile error by moving it outside of go block.
Upgrade cljx