script.js:
	Added call to initGame, canvas resize works.
game.js:
	added loading of preloarer script
game.js:
	Changed structure to get Loader-class script
Added loader.js:
	A class designed to handle the loading of required resources.
	Added initialization of load queue (empty).
Added a spritesheet for some spaceships.
Loader's callback function not working, commented until it can be fixed.
game.js:
	Changed into class definition (Game), constructor now handles initialization.