GUI -- Created NavService and implemented simple navigation (click on the bird!)

Change-Id: I2bda5a3a1b279167194a84564408760eebcb59fd
diff --git a/web/gui/src/main/webapp/app/fw/mast/mast.html b/web/gui/src/main/webapp/app/fw/mast/mast.html
index dc086e9..e10d6ca 100644
--- a/web/gui/src/main/webapp/app/fw/mast/mast.html
+++ b/web/gui/src/main/webapp/app/fw/mast/mast.html
@@ -1,3 +1,3 @@
 <!-- Masthead partial HTML -->
-<img class="logo" src="../data/img/onos-logo.png">
-<span class="title">Open Network Operating System</span>
\ No newline at end of file
+<img class="logo" src="../data/img/onos-logo.png" ng-click="mastCtrl.toggleNav()">
+<span class="title">Open Network Operating System</span>