Started fleshing out the UI topo model classes.
If reviewing this, please refer to http://tinyurl.com/onos-ui-topo-model

Change-Id: I4738392bec1a89c37dff15eff6fe04d66fcabd95
diff --git a/core/api/src/main/java/org/onosproject/ui/model/topo/UiNode.java b/core/api/src/main/java/org/onosproject/ui/model/topo/UiNode.java
index 53bdfde..e39a7d2 100644
--- a/core/api/src/main/java/org/onosproject/ui/model/topo/UiNode.java
+++ b/core/api/src/main/java/org/onosproject/ui/model/topo/UiNode.java
@@ -19,5 +19,5 @@
 /**
  * Represents a node drawn on the topology view (region, device, host).
  */
-public abstract class UiNode extends UiElement {
+abstract class UiNode extends UiElement {
 }