added an example to the demo docs and configured it to use sticky nav for the demo to work

demo_docs/source/index.rst

@@ -17,6 +17,7 @@ Contents:
 
     demo
     list
+    long
 
 Maaaaath!
 =========

demo_docs/source/long.rst

@@ -0,0 +1,124 @@
+Long Sticky Nav
+===============
+
+This section demonstrates how the 'sticky_navigation' setting behaves when the menu is very long.  When this section is selected, it will make the menu and the main area scroll when you are at the top of the page.
+
+
+Example Menu 1
+--------------
+
+Just a place holder...
+
+
+Example Menu 2
+--------------
+
+Just a place holder...
+
+
+Example Menu 3
+--------------
+
+Just a place holder...
+
+
+Example Menu 4
+--------------
+
+Just a place holder...
+
+
+Example Menu 5
+--------------
+
+Just a place holder...
+
+
+Example Menu 6
+--------------
+
+Just a place holder...
+
+
+Example Menu 7
+--------------
+
+Just a place holder...
+
+
+Example Menu 8
+--------------
+
+Just a place holder...
+
+
+Example Menu 9
+--------------
+
+Just a place holder...
+
+
+Example Menu 10
+---------------
+
+Just a place holder...
+
+
+Example Menu 11
+---------------
+
+Just a place holder...
+
+
+Example Menu 12
+---------------
+
+Just a place holder...
+
+
+Example Menu 13
+---------------
+
+Just a place holder...
+
+
+Example Menu 14
+---------------
+
+Just a place holder...
+
+
+Example Menu 15
+---------------
+
+Just a place holder...
+
+
+Example Menu 16
+---------------
+
+Just a place holder...
+
+
+Example Menu 17
+---------------
+
+Just a place holder...
+
+
+Example Menu 18
+---------------
+
+Just a place holder...
+
+
+Example Menu 19
+---------------
+
+Just a place holder...
+
+
+Example Menu 20
+---------------
+
+Just a place holder...

sass/_theme_layout.sass

@@ -301,3 +301,6 @@ footer
 nav.stickynav
   position:fixed
   top:0
+  bottom:0
+  overflow-x:hidden
+  overflow-y:hidden