[WIP] Feature: Notes with Webpack / CommonJS

Remaining work:

* [ ] Add a dev server / watch for live updates.
* [ ] Get Mocha tests work in (1) browser, and (2) karma.
* [ ] Get Jasmine tests work in (1) browser, and (2) karma.
* [ ] Get source maps served from different directory and with a host prefix (e.g., `http://127.0.0.1:3000/`)