GUI -- Sketched out structure for multi-views; each with own controller, template html and css.
- routes currently hard-coded... some thought needed to handle views contributed at runtime.

Change-Id: Ied012744d74e46c5072143283364557f9485056c
diff --git a/web/gui/src/main/webapp/app/view/topo/topo.html b/web/gui/src/main/webapp/app/view/topo/topo.html
new file mode 100644
index 0000000..a1e0749
--- /dev/null
+++ b/web/gui/src/main/webapp/app/view/topo/topo.html
@@ -0,0 +1,10 @@
+<!-- Topology View partial HTML -->
+<div id="ov-topo">
+    <h2> Topology View </h2>
+
+    <p>
+        This is a place-holder for the topology viewer.
+    </p>
+
+    <div class="msg"> {{ctrl.message}} </div>
+</div>