Merge into master from pull request #158:

Document the new ITopologyService method (https://github.com/floodlight/floodlight/pull/158)

src/main/java/net/floodlightcontroller/topology/ITopologyService.java

@@ -185,9 +185,10 @@ public interface ITopologyService extends IFloodlightService  {
     public Set<NodePortTuple> getBlockedPorts();
     
     /**
-     * Returns a set of link updates, which had been applied
-     * in computing the new topology.
+     * ITopologyListener provides topologyChanged notification, 
+     * but not *what* the changes were.  
+     * This method returns the delta in the linkUpdates between the current and the previous topology instance.
      * @return
      */
-    public Set<LDUpdate> getAppliedLinkUpdates();
+    public Set<LDUpdate> getLastLinkUpdates();
 }

src/main/java/net/floodlightcontroller/topology/TopologyManager.java

@@ -429,7 +429,7 @@ public class TopologyManager implements
     }
 
     @Override
-    public Set<LDUpdate> getAppliedLinkUpdates() {
+    public Set<LDUpdate> getLastLinkUpdates() {
     	return appliedUpdates;
     }
     ////////////////////////////////////////////////////////////////////////