Implement GPS filter feature into iRT GTasks Outliner (because original developer became unreachable) -- 2

iRT GTasks Outliner is in BETA state. [login to view URL] I tried to reach the developer in e-mail & Google+, but nothing happened. I also offered payment to implement the GPS filter feature, but I also did no receive answer. I'm afraid, something happened with the developer, so the app will not be developed anymore. The only solution to have new features implemented into the app to ask another developer to reverse engineer the code and implement new features. Task: - Reverse engineer the app (because original developer became unreachable). - Implement options to turn on GPS filtering feature (on-off) & add range options (meters) & GPS filtering update time frequency (seconds) - Implement button and/or menu item to turn on the GPS filter feature on the GUI. - Implement new GPS filter feature into iRT GTasks Outliner BETA. Should display only those tasks in current category & subcategories, which are within X meters around the actual GPS position. Should be done in real-time.