Added synchronization code and unit test.

Synchronisation fails if the trusted host has no new messages - this needs to be fixed (but shouldn't be an issue for real world applications)

networking/build.gradle

@@ -12,6 +12,8 @@ uploadArchives {
 
 dependencies {
     compile project(':domain')
-    testCompile 'org.slf4j:slf4j-simple:1.7.12'
     testCompile 'junit:junit:4.11'
+    testCompile 'org.slf4j:slf4j-simple:1.7.12'
+    testCompile 'org.mockito:mockito-core:1.10.19'
+    testCompile project(':security-bc')
 }