Trumbowyg lightweight rich editor svg icons not showing up

I was wondering if anyone has dealt with this plugin: http://alex-d.github.io/Trumbowyg/

I believe I'm doing everything right. The only thing is that svg icons are not showing up?

$('#trumbowyg-demo').trumbowyg({
  svgPath: 'my-path-to-icons' //doesn't event work
});

Is the icons.svg file correct -- from the download?

This is what's showing up