Refining the directory structure.

Added a test directory and a script in the root to execute tests.
Rename app to sample_app. Also appended .md to README.md so it's rendered
properly.
Added email to MIT license
A year later, did some simple cleanup.

Glad what I did a year ago was obviously over complex, that's
progression right? Removed unnecessary instance vars in nnet.py,
added base project dir to the path in test.py.

Also took half the iterations out of sample_app.py, that ran a long
time and wasn't totally necessary (though, with a little bad luck, it
could actually take that long, but probably not).