Updates to allow quick installation and compatibility with Python 2.xxx

You can now install any dependancies with a single command to get the server up and running. Added an `example.wav` file to generate a spectrogram from. This file could be updated to match the screenshot.
Is there a popular Javascript linting tool or convention that requires this? 

Otherwise, I'd prefer the matrix columns to line up vertically. Vertically aligned values make it easier to see that this is meant to be a 3x3 transformation matrix.