Tweaks to webpack aliases to get jupyter-js-widgets work
Tweaks to webpack aliases to get jupyter-js-widgets work

Thanks to Steve Silvester for these changes.

jupyter/jupyter-js-plugins,jupyter/jupyter-js-plugins,blink1073/jupyter-js-plugins,jupyter/jupyter-js-plugins,jupyter/jupyter-js-plugins,blink1073/jupyter-js-plugins,blink1073/jupyter-js-plugins,blink1073/jupyter-js-plugins,blink1073/jupyter-js-plugins,jupyter/jupyter-js-plugins