Clean up legacy Cokefile code
Outsource debounce to lodash

only in Cokefile. Don't really want all of lodash in the main script
yet, especially since the argument order is stupid. Maybe component?
Need to make a component.json and shit though, and `npm install -g
component`...
Use stylus sync API for simplicity
Add compilation time metrics

Not too bad for me:

Commonjsification: 786ms
Coco compilation: 583ms
JS reparsing: 90ms
AST->JS source generation: 151ms
Total build time: 1098ms
compiled script to html5chan.user.js

Not _great_, but coco is ~55% of the time, and cjs is ~20%. JS reparsing
is pretty fast, but should be unnecessary. Need to work on that coco->js
AST patch. Maybe this weekend [spoiler]lel[/spoiler].