Adds conversion between R1 .mat files and Python Projects

[alexhroom]

Fixes #46 by adding functions r1_to_project_class and project_class_to_r1, which convert between R1 .mat files and Python Projects.

[DrPaulSharp]

This is looking good, alongside the specific comments:

• Please make a python script to go alongside the jupyter notebook for the example.
• Have a look at the matlab example and see what you can incorporate from it into the python script and notebook.
• See if you can test the save to matlab - take a look at tests in "test_inputs" and "test_wrappers" to see if you can write somethimg similar.

[DrPaulSharp]

See specific comments

[DrPaulSharp]

See the specific comment, plus also please make the new example importable by adding an __init__.py to the convert_rascal_project directory and adding this example to the __init__.py in the examples directory.