Update the badge count to reflect ongoing calls.

This is useful in the case an incoming call is received but Linphone is
in the background.
Also disable ringing once the application gets in the foreground.

Classes/LinphoneAppDelegate.m

@@ -111,6 +111,9 @@
 			instance->currentCallContextBeforeGoingBackground.call = 0;
 		} else {
             [[PhoneMainView  instance ] displayIncomingCall:call];
+            // in this case, the ringing sound comes from the notification.
+            // To stop it we have to do the iOS7 ring fix...
+            [self fixRing];
         }
 	}
 }

Classes/PhoneMainView.m

@@ -345,6 +345,7 @@ static PhoneMainView* phoneMainViewInstance=nil;
     int count = 0;
     count += linphone_core_get_missed_calls_count([LinphoneManager getLc]);
     count += [ChatModel unreadMessages];
+    count += linphone_core_get_calls_nb([LinphoneManager getLc]);
     [[UIApplication sharedApplication] setApplicationIconBadgeNumber:count];
 }