Delete What is the IPython Notebook?.ipynb

question mark is not valid in windows,
it wreaks havoc on windows machines when cloning.
please remove from repo
strange behaviour deleting all files?
ignore filemode changes

Revert "strange behaviour deleting all files?"

This reverts commit c9e64ad6d1b8a90763a5c3842a43402855915c6a.
Merge pull request #23 from NelisW/master

Delete What is the IPython Notebook?.ipynb