Import Notebook version

Fix import Notebook version #156

Marked compability

Fix marked.js

Update for NbClassic and install compatibility

Bugfix for problem with NbClassic and remove deprecated script entry in setup.py

NbClassic support

Bugfix for problem with NbClassic.

Minor update

Add license.txt to config.cfg

0.4.1: Merge pull request #92 from juhasch/master

Fix for nbextensions tab not shown in notebook.