cparvini's Bonus Notebook Submission

I hope that this is how you would like the submissions to arrive...I've
got a working directory with my original file, and it also contains the
actual submission, denoted by the "Bonus_Notebook" in the title. Let me
know if there are any issues, and happy holidays!
Adding a README.md and Copyright line

Added a README and Copyright line, in addition to several clarifications
in the notebook at the request of my in-class group.
Additional license and grammar

Added the MIT code license and made grammatical changes to the body.
Fixed a couple places where subscript help to explain what each variable
corresponds to in the 3D grid, and went a bit more in depth about the
Leapfrog choice (with regards to the CFL condition).
Cleaned up directory & included ncclementi's input

Went ahead and made the changes to the files suggested by ncclementi,
and also removed the miscellaneous files.
Merge pull request #8 from cparvini/master

cparvini's Bonus Notebook Submission