Support Jupyter Lab

[EricMaibach]

Putting this here mostly just to notify anybody else that is using Jupyter Lab and can't figure out why it is not working. For me it is only working in Jupyter Notebook, not Jupyter Lab.

Really appreciate the work to make this.

[Oceania2018]

@kerryjiang Jupyer Lab is the next-generation user interface for Project Jupyter offering all the familiar building blocks of the classic Jupyter Notebook.

[RobertoMaurizzi]

Funnily enough, it sort-of works for me:
When the kernel first starts, it won't ever finish, but if I stop it it will first restart, then it'll process cells:

The obvious problem is that JupyterLab thinks the kernel is always 'busy' even if it's actually able to process new cells.

I tried this today on JupyterLab 1.2 but it worked more or less the same on 1.1