human readable time representation for toString

Example:
 LinkEvent{time=2014-10-28T23:24:23.461, ...

Change-Id: I439cea488afd97dfa4f1c1e5770f2e2d7b64d321
diff --git a/features/features.xml b/features/features.xml
index db0ede6..088e42f 100644
--- a/features/features.xml
+++ b/features/features.xml
@@ -32,6 +32,8 @@
         <bundle>mvn:io.netty/netty-transport-native-epoll/4.0.23.Final</bundle>
         <bundle>mvn:commons-pool/commons-pool/1.6</bundle>
 
+        <bundle>mvn:joda-time/joda-time/2.5</bundle>
+
         <bundle>mvn:com.hazelcast/hazelcast/3.3.2</bundle>
         <bundle>mvn:io.dropwizard.metrics/metrics-core/3.1.0</bundle>
         <bundle>mvn:io.dropwizard.metrics/metrics-json/3.1.0</bundle>