Installing midi.js and getting one note to play

* Added inc, MIDI, soundfont, and Window folders to app/assets/javascripts
* Added midi_test.js that plays the note when a button is pressed
* Added midi_test.html.erb that displays the play button
* Added resources and made midi_test the root page in routes.rb
* Getting a 404 error: [20:03:37.596] GET http://localhost:3000/soundfont/acoustic_grand_piano-ogg.js [HTTP/1.1 404 Not Found  23ms]
* Note plays in Firefox and Chrome but not Safari