So this was originally some goofy code. From what I can tell, this was only used as a way to use HTML passed-in as an option to override the HTML in the text area. We don't really do that anywhere else, and consistently use `this._options` for that exact kind of thing, so let's remove this special case.

Make it so `this._options.html` get the `jQuery(elem).val();` if it wasn't already set to something. Then modify the editor files to just use `this._options.html` instead of `this._innerHtml`. Good call with the name `innerHtml` though. If we needed to keep it, that would be the best label.