TinyMCE 4.0.11 - Automatically remove width and height attributes from img elements inserted via the img plugin

gistfile1.js

setup: function (editor) {
    editor.on('init', function(args) {
        editor = args.target;

        editor.on('NodeChange', function(e) {
            if (e && e.element.nodeName.toLowerCase() == 'img') {
                tinyMCE.DOM.setAttribs(e.element, {'width': null, 'height': null});
            }
        });
    }
}