MBTile Tile Merge tool
##USage: mergetiles.py -src src_mbtiles_file -dest dest_mbtiles_file -zoom zoom_level1,zoom_level2,zoom_level3,...
ex) python mergetiles -src src.mbtiles -dest dest.mbtiles -zoom 17,18,19
'minZoom','maxZoom','bounds' entry of metadata table will be automatically update with max zoom level extent.
Need python2.7 or later and sqlite3 python module.