Added tileWidth and tileHeight to layers
Implemented reuse pool for tile entities
Don't use an entity for empty tiles
Added tile shifting, z-ordering, camera component
Ended all files with newlines
Implemented tmx object parsing
Include custom properties for tmx objects
Fixed UInt32 truncation problem, misc tile system updates.
Merge pull request #26 from thelukester92/tile-system-changes-and-shifting

Update tile system and add tile shifting