Optimize the bundled/gzipped size of ylem

[DesignByOnyx]

Currently ylem is 109K minified / 27.4K gzipped. This was determined by running a build using this test repository, and then running the built code through Google closure compiler.

Here's how that stacks up against others:

Library	Size (minified / gzipped)	URL
MobX	49.1 KB / 14.9 KB	mobx
MobX React	16.4 KB / 6.2 KB	mobx-react
Redux	6.2KB / 2.5KB	redux
Redux React	12.5 KB / 4.5 KB	redux-react

MobX total: 21.1KB Redux total: 7KB