* moved mbtiles implementation to https://github.com/consbio/pymbtiles
0.4.0
* added `--preview` option to `export disk` command, which opens a simple preview map of the exported tiles.
0.3.0
* added `path_format` to `TPK::to_disk` and `--path-format` option to CLI `export disk` command to allow control over output filename. * changed default output path format for exporting to disk to `z/x/y.ext` instead of `z/x_y.ext`.