Base stations do not expire

[rossengeorgiev]

After a prolonged use, base stations who are no longer active will still stay on the map as there is no method to remove them. A refresh of the page is will remedy the problem.

Case:

Mobile tracker is running in a mobile browser, the browser is suspended for a few days, when we relaunch the app, it will fetch the latest data since the suspension. The will be cluttered with base stations of which only a few are currently active.