Installation (registration) problem

[ThomasBreuer]

The package documentation says in Section 1.2 that one can register the GAP Jupyter kernel with python setup.py install --user. I got messages of the kind No module named notebook.nbextensions in this step, and the registration did not work. This problem disappeared when I used python3 instead of python2. Should the manual require python3? On the other hand, the example shown in Section 1.3-1 suggests that also python2 should work.

(By the way, the manual should say that the python call must be executed in the directory of the package, where the file setup.py resides. And the manual should say that it might be necessary to repeat the registration step after upgrading the JupyterKernel package to a new version.)

[ZachNewbery]

Should be fixed by #106

[olexandr-konovalov]

Also #119 provides more detailed installation instructions, and tells that some steps should be repeated after upgrade.