cleaning
touch sounds as a sprite
Merge branch 'phaser' of https://github.com/NeatNait/pixelement into phaser

# By triskbit
# Via triskbit
* 'phaser' of https://github.com/NeatNait/pixelement:
  music, platforms and difficulty

Conflicts:
	src/js/game.js
	src/js/preloader.js