thinking about adding a helper to get iterators off an iterable

ES6 iterable Imean - it's currently a bit annoying - you have to get the property and bind it etc.

@roman01la https://clojure.atlassian.net/projects/CLJS/issues/CLJS-3199 I see you submitted a patch for this

I think that patch does too much - I'm only going to do the extra case for seq , let me know if you have some rationale for the other parts

Don't remember what are other parts for. Perhaps handling metadata and js-clj conversion, don't think it's too important, so should be fine