lots of WIP with js sandboxing, webworkers
returnify working?
WIP new uniquing
woot! local works great! next: webworker unique $display, etc. calls
refactor -- moving all the js* stuff into a separate directory

Might want to have a "kernel plugin system" defined. Could be need to be extensible.
we now have webworker magic!!
style nit
we have post-creation configuration of documents
show/hide the iframe!
hide `undefined` output. Also fix vega update error
jsx magic!!