use Quill.js for a CLJS REPL

Not to be confused with [Quil](http://quil.info) is [Quill.js](http://quilljs.com/), a JavaScript widget designed to be cross-platform and take advantage of native OS support for rendering.

Quill.js, at least on Mac OS X, supports some Unicode character sets well that other text area / REPL widgets do not support well.

It would be nice to swap in Quill.js for the REPL box once a webpage can be created that has the REPL widget for a CLJS REPL next to the Quil canvas that it controls.