First Spangy module pull request

[GerardMJuan]

First proposed version of the Spangy package implemented in Python. Functions work, but:

• Unitests need to be completed, right now they are empty.
• Documentation could be improved.
• Further comments on the example file.

[gauzias]

pep8 is not good, please correct before we can merge

[gauzias]

great job, thanks