Centralizes user variables

src/main/java/ch/hepia/Main.java

@@ -25,12 +25,14 @@ public class Main extends Application {
 	 */
 	public static void main(String[] args) throws Exception {
 		MessageManager m = new MessageManager(
-				AppConfig.RABBITMQ_HOSTNAME, "frog", "poney1234", "broadcaster");
+				AppConfig.RABBITMQ_HOSTNAME, AppConfig.RABBITMQ_USERNAME, AppConfig.RABBITMQ_PASSWORD,
+				AppConfig.RABBITMQ_EXCHANGE
+		);
 		m.sendJoinedJourney(new JoinedJourney(new User("Théo"), new ArrayList<>()));
 		m.subscribeJoinedJourney(joinedJourney -> System.out.println("When I was hungary"));
 		m.subscribeChatMessage(chatMessage -> System.out.println(chatMessage.getUser().toString() + ": " + chatMessage.getMessage()));
 		m.sendChatMessage(new ChatMessage(new User("Alexis"), "Bonjour le monde !"));
-		//launch(args);
+		launch(args);
 	}
 
 	@Override

src/main/java/ch/hepia/config/AppConfig.java

@@ -9,5 +9,8 @@ public final class AppConfig {
 	public static final Integer APP_HEIGHT = 565;
 
 	public static final String RABBITMQ_HOSTNAME = "redgrave.science";
+	public static final String RABBITMQ_USERNAME = "frog";
+	public static final String RABBITMQ_PASSWORD = "poney1234";
+	public static final String RABBITMQ_EXCHANGE = "broadcaster";
 	public static final Integer RABBITMQ_PORT = 5672;
 }