Merge pull request #48 from vross/master

Add option to control JSONP callback for UTFGrid tiles.
Bump version
Work around Python's ¿"UTF8" "support"?
Add the possibility of making MBTiles from files on the disk.
typo
Remove dead code, os.path.mkdir does not even exist
Add basic write/read/write test for grids to MBTiles
Merge pull request #1 from leplatrem/grid_to_mbtiles

Grid to mbtiles