Application may crash on exit #96

Describe the bug
In the example 13, when applications receive notification to exit, they may crash with the exception. The reason is generating response event of non exiting Proxy. In the current implementation there is a quick work around to lock the resources when generate response event.
See and track lockProxyResource() and unlockProxyResource() methods in ProxyBase class. The methods are used in RemoteEventFactory class (line 113).

Hint to fix
Use shared pointers in the resource map of ProxyBase class to avoid using a pointers of non existing objects. Pay attention on performance and optimization.