Adding user to their own contacts, reusing one database transaction

Fixes #15

src/main/java/envoy/server/net/ObjectMessageProcessor.java

@@ -33,6 +33,7 @@ public class ObjectMessageProcessor implements IMessageProcessor {
 	 */
 	public ObjectMessageProcessor(Set<ObjectProcessor<?>> processors) { this.processors = processors; }
 
+	@SuppressWarnings("unchecked")
 	@Override
 	public void process(Message message, WriteProxy writeProxy) {
 		try (ObjectInputStream in = new ObjectInputStream(new ByteArrayInputStream(message.sharedArray, message.offset + 4, message.length - 4))) {