Fix gh-14: compress all the things

[gibson042]

In addition to updating the output, this lets us utilize arbitrary compression functions (and any number of them, to boot) and totally guts the unit tests.

   raw     gz Sizes                                                             
 10367   3197 tasks/compare-size.js                                             
 25862   4439 test/compare-size.js                                              

   raw     gz Compared to last run                                              
 +2372      ? tasks/compare-size.js                                             
 +4502   +877 test/compare-size.js                                              

I've been in the trees for a while, so I'd like someone to survey the forest and make sure this is the way to go.

[gibson042]

@rwldrn?

[rwaldron]

Sorry, I was in San Jose at TC39 meeting and completely forgot about this :(

I'll leave the window open so I address this first thing in the AM.