Custom c++ observer is not receiving notifications

[rckrdstrgrd]

When trying to use a custom observer in c++, no notification is received.

The problem seems to be in two places.

1. It's not possible to override the observer functions handleNotification(int aNotificationType) and handleNotification(int aNotificationType, int aValue) because these are not declared as virtual in observer.h. When these functions later are called the parent functions will be invoked, the virtual declaration is needed to achieve late binding of these functions.

2. The vector list of observers in notifier.cpp will never be filled. This line:
   std::vector<Observer*> observers = it->second;
   will create a copy of the observer vector, and subsequent calls to observers.push_back( aObserver ); will be executed on the copy and not the vector in the map. Calling push_back directly on it->second will work.

[igorski]

Great catch! Taken the liberty to take your fixes from your fork into a merge. See #34