Adding support for user interface extensions.

Change-Id: I1e41d16efc11be31ad4c2fb0c09e86e3dfd26706
diff --git a/web/gui/src/main/resources/WEB-INF/classes/nav-template.html b/web/gui/src/main/resources/WEB-INF/classes/nav-template.html
new file mode 100644
index 0000000..25c6e36
--- /dev/null
+++ b/web/gui/src/main/resources/WEB-INF/classes/nav-template.html
@@ -0,0 +1,7 @@
+<!-- Navigation partial HTML -->
+<h2>Navigation</h2>
+<h3>(Note - this is temporary)</h3>
+
+<ul>
+    <!-- {INJECTED-VIEW-NAV} -->
+</ul>