Preferred import style for python examples

[michael-c-brennan]

As mentioned in #145, how we import MParT in our python examples will most likely become the de facto standard for using the python bindings. How should we import MParT in the python examples?

[rubiop]

I like mt or mpart the most, I don't know if it is a regularly used library but I have been using the multiprocessing library and the import is usually mp. from mpart import * can be good as the code will looks exactly like matlab but I am not sure how the general opinion is for this type of import.