added opt course examples, and added gradient calculation of more than one output when using the wrapper

problems example elaborated. its noted however that make_notebooks is not working due to a bug in the drivers.ipynb

Witold Skrzypiński authored 5 years ago and Mikkel Friis-Møller committed 5 years ago

Inputs for calculate_devex and calculate_capex converted from lists to np arrays within the methods.

adding try/except for linux test machine

removing png tracking, changing fig loc