unworking rotation fixes, indentation, minor stuff
more rotation stuff
fixed #17
fixed tile dimension calculation, added led_tile_get_bounding_box(), indentation
removed some debugging messages, added led_tile_get_transformed_bounding_box()
properly round & cast double -> int
fixed bounding box calculation (always is max(x/y)+1)
added LED_FRAME_*_MIN/MAX
removed commented obsolete stuff
indentation
fixed _transform_tile_box, indentation