def get_tile(lat, lon, zoom, style_id = nil, tile_size = nil)
      get_xy_tile(xtile(lon, zoom), ytile(lat, zoom), zoom, style_id, tile_size)
    end
def get_tile(lat, lon, zoom, style_id = nil, tile_size = nil)
      get_xy_tile(xtile(lon, zoom), ytile(lat, zoom), zoom, style_id, tile_size)
    end
Get tile with given latitude, longitude and zoom.
 Returns Raw PNG data which could be saved to file

 * +lat+ Latitude of requested tile
 * +lon+ Longitude of requested tile
 * +zoom+ Zoom level, on which tile is being requested
 * +style_id+ CloudMade's style id, if not given, default style is used (usually 1)
 * +tile_size+ size of tile, if not given the default 256 is used