Using different favicon's would make navigation easier

[jasongrout]

Migrating from jupyter/jupyter#118:

Since we are tending toward a full OS in the browser... ;-) I think it would help to be able to differentiate the jupyter-js-filebrowser, jupyter-js-editor, jupyter-js-terminal and jupyter-js-notebook navigation tabs from the favicon.

CC @dubourg

[JamiesHQ]

Hey @jasongrout : is this still an open issue? thanks!

[jasongrout]

I think it's fine to leave it open as a sprint friendly issue for the classic nnotebook, or close it since development is shifting to lab. Either one.

[JamiesHQ]

thanks Jason! I'll leave that up to @gnestor

[jasongrout]

It is still an unresolved issue, so sure, leave it open. My guess is that we'll close a lot of issues when we sunset the notebook.

[gnestor]

Check out #2452

[JamiesHQ]

^^ @jasongrout ^^