notify user when push to device fails Fixes #593
named function expression -> anonymous function
maintain backwards compatibility with jsm
use parentheses around destructured assignment to outer scope
Merge pull request #630 from nickdesaulniers/pushFail

notify user when push to device fails Fixes #593
warn if position watcher called while Simulator not running
stop watching geolocation before closing client
Merge pull request #640 from mykmelez/client-null

prevent `this._remote is null` exception in position watcher (fix #579)