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!
``` bash
if [ -z ${BILLY} ]; then
  echo "hi";
fi
```

Should do it for you.  You can `man test` to see about all of the various predicates available.