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!
If I understand your question correctly, you mean will it yield the same results given the same source files? I think yes.

However, I meant to take it out for Jellyfish, but forgot. Will fix that.

I think it's only really useful for Blip, which has more client-side dependencies...