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.css b/web/gui/src/main/webapp/app/fw/mast/mast.css
index 9a68e0a..0722f6d 100644
--- a/web/gui/src/main/webapp/app/fw/mast/mast.css
+++ b/web/gui/src/main/webapp/app/fw/mast/mast.css
@@ -39,6 +39,12 @@
     height: 38px;
     padding-left: 8px;
     padding-right: 8px;
+    cursor: pointer;
+}
+
+#mast img.logo:hover {
+    /* need something better */
+    /*background-color: #888;*/
 }
 
 #mast .title {