Swapped tileSize to tileWidth and tileHeight.
Updated SpriteSheet model and serializer to use tile width and height.
Removed tileSize references from JS.
Updated barbarian spritesheet.
Swapped imp for "night elf" based off barbarian.
Swapped references to x and y to top_left_x and y.
Removed unneed accessing of sprite sheet property and jshint.