Regenerating javascript bundle breaks scopes with imports

[rdeits]

This is the root cause of the problems I'm having with #99

Using WebIO.jl master, I can successfully run the scope import demo from the readme: https://github.com/JuliaGizmos/WebIO.jl#loading-javascript-dependencies in IJulia.

But if I follow the instructions to re-generate the javascript bundle, with:

using WebIO
WebIO.devsetup()
WebIO.bundlejs()

then the newly generated bundle seems to be somewhat broken. Attempting to run the same demo from the readme results in no output in IJulia, and the following error in the javascript console:

Error: Cannot find module "vm".
  Instantiating http://cdnjs.cloudflare.com/ajax/libs/p5.js/0.5.11/p5.js
  Loading //cdnjs.cloudflare.com/ajax/libs/p5.js/0.5.11/p5.js

It looks like whatever webpack setup I'm getting with devsetup() is subtly broken or different than what was used to generate the bundle last.

[rdeits]

I suspect the issue is that the devsetup just installs webpack and webpack-cli without any version restrictions or locks:

WebIO.jl/deps/_devsetup.jl

Line 16 in 204f580

run(`$npm install webpack webpack-cli --scripts-prepend-node-path`)

while bundlejs() has a package.json that specifically expects webpack ^3.8 etc.

[rdeits]

Hm, trying to pin down those versions doesn't resolve the issue. I'm pretty stumped.