Support for PAIP examples

[davazp]

A while back, there was this issue about running PAIP code in the browser:

https://github.com/norvig/paip-lisp/issues/10

Unfortunately, I did not have the time/energy to push that forward, which was a shame. JSCL has progressed quite a lot since then, so I don't think this would be too difficult.

I'm creating the issue here as well, in case someone is interested in pursuing this, let me know! 👍