Term Project Pull Request

Term Project for IntrotoPython Class 1; custom class for reading and plotting validated environmental data.
Separate your functions and your script. If you leave the functions on the top, and collect the script in an 

if __name__ == "__main__": 

block, it not only improves readability, but also allows you to import the functions elsewhere, without dealing with the script part. Iow, if you want to use these functions later, without running the script, you can just import the module, but you can still run the module as a program, as you do here.