Update sample, now we download mbtiles, and gets the center of it
Update sample, now we download mbtiles, and gets the center of it

ffournier/cordova-plugin-mbtiles,andreacimino/cordova-plugin-mbtiles,andreacimino/cordova-plugin-mbtiles,andreacimino/cordova-plugin-mbtiles,andreacimino/cordova-plugin-mbtiles,ffournier/cordova-plugin-mbtiles,ffournier/cordova-plugin-mbtiles,ffournier/cordova-plugin-mbtiles,andreacimino/cordova-plugin-mbtiles,ffournier/cordova-plugin-mbtiles