Adding user to their own contacts, reusing one database transaction

Fixes #15

src/main/java/envoy/server/processors/LoginCredentialProcessor.java

@@ -54,6 +54,7 @@ public class LoginCredentialProcessor implements ObjectProcessor<LoginCredential
 		// Create contacts
 		Contacts contacts = new Contacts(user.getId(),
 				user.getContacts().stream().map(envoy.server.data.User::toCommonUser).collect(Collectors.toList()));
+		contacts.getContacts().add(user.toCommonUser());
 
 		// Complete handshake
 		System.out.println("Sending user...");