Embed midi player demo

Embedded MidiFile player

This script uses MIDI.js's player (and their HTML, etc.) to make it easy to add a MIDI player for any file or base64 data. The script looks something like this:

<div id='putMeHere'>

require(['music21'], function(music21) {
    mp = new music21.miditools.MidiPlayer();
    mp.addPlayer('#putMeHere');
    mp.base64Load('data:audio/midi;base64,TVRoZAAAAAYAAAABAYBNVHJrAAAu3QD/UQMH0zQA/wM...');
});