Missing background color initialization fixed
Fixed texture filling in TextureAtlasBuilder, now fills correctly
ByteBuffer.array() not working in ImageLoader, changed to buffer to array copy loop
 Fixed some bitwise operator mistakes (especially with signed integers) in Color
Fixed substring bounds in getExtension in FileUtils
Fixed TexCoordRects not being initialized in AnimationSheet
Set sprite's default size to (1,1)
Fixed a lot of buffer/OpenGL/null pointer errors