Centralizes app variables

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

@@ -12,5 +12,5 @@ public final class AppConfig {
 	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;
+	public static final Integer RABBITMQ_PORT = 5672; // The MQ uses the default port, so this value is not used.
 }