Fixed a few problems:

- some bugs that creeped in when I moved security into its own adapter
- improved some DB code as it doesn't work in Android anyway
- all entities should be serializable (very useful in Android)

networking/src/main/java/ch/dissem/bitmessage/networking/DefaultNetworkHandler.java

@@ -27,6 +27,7 @@ import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
 import java.io.IOException;
+import java.net.InetAddress;
 import java.net.ServerSocket;
 import java.net.Socket;
 import java.util.*;
@@ -149,6 +150,11 @@ public class DefaultNetworkHandler implements NetworkHandler, ContextHolder {
         }
     }
 
+    @Override
+    public void synchronize(InetAddress trustedHost, int port, MessageListener listener) throws IOException {
+        startConnection(new Connection(ctx, CLIENT, new Socket(trustedHost, port), listener, requestedObjects));
+    }
+
     private void startConnection(Connection c) {
         synchronized (connections) {
             // prevent connecting twice to the same node