Remove comments from output javascript

They're noisy and unnecessary.
No longer highlight regular expressions

This was causing trouble with lines that included division because I
couldn't figure out an elegant way to distinguish between (+ (/ 1 2) (/
3 4)) being a regex with the contents of " 1 2) (" from within emacs.
There's probably a way, but it's easier just to remove the
functionality.
switch "repositories" for "repository" as npm demands
Add a build script for npm

Now you can rebuild sibilant with `npm run-script build.`  This
probably should be in a make/rake/jake file of some sort, but that
seems like overkill for a one-liner.