Prefer codemirror mode if given
Prefer codemirror mode if given

blink1073/jupyter-js-notebook,jupyter/jupyter-js-notebook,blink1073/jupyter-js-notebook,blink1073/jupyter-js-notebook,jupyter/jupyter-js-notebook,jupyter/jupyter-js-notebook,blink1073/jupyter-js-notebook,jupyter/jupyter-js-notebook,blink1073/jupyter-js-notebook,jupyter/jupyter-js-notebook