Event driven architecture refactored.

1. Renamed Message to Event and Event to AbstractEvent
2. Generified Event and Handler
3. Updated EventDispatcher to make unsafe configuration impossible
4. Updated UML diagram accordingly

event-driven-architecture/src/test/java/com/iluwatar/eda/event/UserCreatedEventTest.java

@@ -29,13 +29,13 @@ import org.junit.Test;
 import static org.junit.Assert.assertEquals;
 
 /**
- * {@link UserCreatedEventTest} tests and verifies {@link Event} behaviour.
+ * {@link UserCreatedEventTest} tests and verifies {@link AbstractEvent} behaviour.
  */
 public class UserCreatedEventTest {
 
   /**
-   * This unit test should correctly return the {@link Event} class type when calling the
-   * {@link Event#getType() getType} method.
+   * This unit test should correctly return the {@link AbstractEvent} class type when calling the
+   * {@link AbstractEvent#getType() getType} method.
    */
   @Test
   public void testGetEventType() {