changed the numbering of notebooks

Scipy notebook

See merge request !7

renamed all other notebooks to have the correct indexing

Text analysis notebook

See merge request !6

added machine learning notebook

See merge request !4

added solutions as well

added more material for the text analysis notebook but still under development

added networks notebook and data

See merge request !5

changed images and added copyrights where applicable
added checker for pip version

Cleaned up notebooks based on feedback from pilot

See merge request !2

# Conflicts:
#   python-data-3-numpy.ipynb
#   python-data-5-pandas.ipynb

slimmmed down all of the material
split the regex part from the pandas notebook into its own seperate notebook