fix exercise title
show timings for elementwise operations
don't mention transpose until it is introduced
exercises for elementwise operations
exercises for comparisons etc..
adding examples for transcendental functions
missing questionmark
Reformat section on reductions and add some exercises
Worked example data-stats
deactivate the random walk example for now
reorder the section on how we have used broadcasting all this time anyway
fix indentation for example class
fixup the distance example
remove comment, not needed
fix some whitespace
fix indentation of reshaping section
a note about having seen np.nexaxis already
fix underline
remove reference to later section
exercise on shape manipulations