Enable load dialog to accept both json and geojson file extensions. Also change action button from 'save' to 'open'.
Change the load/import button to be more specific. (e.g., instead of just 'save/open').
Validate that JSON file contains expected element (avoids NullPointerException).
enable features to be extracted from geojson
Make the load dialog say 'load' instead of 'save'.
Implement geojson waypoint feature loading from more complex geojson files.