Add default tolerance_px to app_config sample
Add default tolerance_px to app_config sample

codeandtheory/cartodb,codeandtheory/cartodb,splashblot/dronedb,splashblot/dronedb,codeandtheory/cartodb,splashblot/dronedb,splashblot/dronedb,codeandtheory/cartodb,CartoDB/cartodb,CartoDB/cartodb,CartoDB/cartodb,CartoDB/cartodb,splashblot/dronedb,codeandtheory/cartodb,CartoDB/cartodb