Handle the case in which the app is in the background when the notifi…

…cation is swiped

As we can see from the logs, if the application is in the background when the
notification is clicked, it is not re-launched but simply brought to the
foreground.

If the notification is "clicked" by choosing one of the custom options, the
existing `handleActionWithIdentifier` methods are called. But if the
notification is simply swiped, then `didFinishLaunchingWithOptions` is not
called, since the app is not launched. Instead, the app is first brought to
the foreground and then `didReceiveLocalNotification` is called.

```
2016-12-09 22:33:58.883 emission[52483:346380] About to dispatch {"id":737678,"title":"Trip just ended","actions":[{"destructive":false,"activationMode":"foreground","title":"Mute","icon":"res://ic_moreoptions","identifier":"MUTE","authenticationRequired":false},{"destructive":false,"activationMode":"foreground","title":"Yes","icon":"res://ic_signin","identifier":"REPORT","authenticationRequired":false}],"category":"REPORT_INCIDENT","text":"Incident to report?"}
2016-12-09 22:33:59.004 emission[52483:346380] Application went to the background
2016-12-09 22:33:59.004 emission[52483:346380] DEBUG: Application went to the background
2016-12-09 22:34:01.541 emission[52483:346380] Application will enter the foreground
2016-12-09 22:34:01.541 emission[52483:346380] DEBUG: Application will enter the foreground
2016-12-09 22:34:01.641 emission[52483:346380] UILocalNotification: could not calculate next fire date - previous = 2016-12-10 06:33:59 +0000 : next = 2016-12-10 06:33:59 +0000 : repeatInterval = 2
2016-12-09 22:34:01.641 emission[52483:346380] Received local notification <UIConcreteLocalNotification: 0x7ffe4a90f060>{fire date = Friday, December 9, 2016 at 10:33:59 PM Pacific Standard Time, time zone = America/Los_Angeles (PST) offset -28800, repeat interval = NSCalendarUnitEra, repeat count = UILocalNotificationInfiniteRepeatCount, next fire date = (null), user info = {
    actions =     (
                {
            activationMode = foreground;
            authenticationRequired = 0;
            destructive = 0;
            icon = "res://ic_moreoptions";
            identifier = MUTE;
            title = Mute;
        },
                {
            activationMode = foreground;
            authenticationRequired = 0;
            destructive = 0;
            icon = "res://ic_signin";
            identifier = REPORT;
            title = Yes;
        }
    );
    at = 1481351639;
    badge = 0;
    category = "REPORT_INCIDENT";
    id = 737678;
    sound = "res://platform_default";
    text = "Incident to report?";
    title = "Trip just ended";
}} while in the foreground, reposting
```

We simply catch that and repost it. This is then listened to by this listener,

```
- (void) pluginInitialize
{
....
    [center addObserver:self
               selector:@selector(didReceiveLocalNotification:)
                   name:CDVLocalNotification
                 object:nil];
}
```
which then calls the plugin's `didReceiveLocalNotification` which does all the
event re-posting

Testing done:
- without this change, notifications are not received
- with this change, notifications are received

src/ios/AppDelegate+APPLocalNotificationAction.m

@@ -34,4 +34,10 @@ - (void) application:(UIApplication *)application handleActionWithIdentifier:(NS
     completionHandler();   
 }  
 
+- (void) application:(UIApplication *)application didReceiveLocalNotification:(nonnull UILocalNotification *)notification
+{
+    NSLog(@"Received local notification %@ while in the foreground, reposting", notification);
+    [[NSNotificationCenter defaultCenter] postNotificationName:CDVLocalNotification object:notification];
+}
+
  @end