Add schemas for tome subscriptions

According to #828, you want schemas written for your stuff.

To test, I've recast manually, clicked snippets, moved forward and backward, beautified, reloaded, changed language to CoffeeScript, opened the Thang list, opened the spell list for a Thang, added a syntax error, added a lint error, and made a manual change and let autocast proc. That leaves 'comment-my-code', which honestly I'm not sure how to fire.