added spritesheet for preloader. will move main game assets to load to preloader from boot state
moved asset loading to preloader
preloading animation complete. will add on complete event soon
preloader complete. however some of the code is a bit wet. Suggestion to self: write a fade in/fade out function that takes a sprite as an argument to be more DRY
cleaned up code for review
Merge pull request #8 from johnlok/preloader

Preloader