Added a noVNC-latest submodule

The noVNC-latest submodule points to the noVNC master commit
(for the moment).  It's useful for testing bugs on other browsers
with SauceLabs without disrupting the main site.

.gitmodules

@@ -4,3 +4,6 @@
 [submodule "noVNC-js1k"]
 	path = noVNC-js1k
         url = git://github.com/kanaka/noVNC-js1k.git
+[submodule "noVNC-latest"]
+	path = noVNC-latest
+	url = git://github.com/kanaka/novnc.git

noVNC-latest @ 3b4fd003

+Subproject commit 3b4fd003c2ba6e0294282ea203e6ead6e9275317