Switch to webpack workflow

A set of changes to match Blip and Clamshell's front-end workflow with Webpack.

@cheddar Do you want to take a look and tell me what you think? Thanks!
See `lib/webclient.js`.

`NODE_ENV=development`: webpack watches the client files and recompiles and changes

`NODE_ENV=production`: just server whatever is pre-built in the `dist/` directory