Removes infinite loop. Does not change song button.
Guess button changes song; gameTracker array keeps track of songs played. Repeats are still possible.
Keeps track of songs played. Still has repeats.
Adds index incrementor for track-list.
Use song index incrementor. Works.
Reformat play button.
Clean up application.js
Merge pull request #6 from antoniodangond/song_tracker

Song tracker