Incorrect webcomponents URL on JuliaBox in iframe

[rdeits]

On JuliaBox, WebIO tries to load the webcomponents module from:

https://juliabox.com/pkg/WebIO/webio/dist/webcomponents-lite.min.js

but instead, it needs to be:

https://juliabox.com/notebook/pkg/WebIO/webio/dist/webcomponents-lite.min.js

It's probably just another absolute vs. relative path thing. I'll see if I can fix it.

[rdeits]

Ah, I see. This only happens inside an iframe when trying to load webio.

[rdeits]

At least two things need to be done to fix this:

• change the webio js path from /pkg/.../bundle.js to pkg/.../bundle.js in iframe.jl
• do the same <base href trick that ijulia_setup.jl does inside the iframe