Nav fixes

Closes sub nav on click of body or other link
Only shows the main link once inside the sub nav
I guess the coffeescript version would be:

NAVIGATION.menu.find('.subnav').not($(this).next()).removeClass 'show-subnav'
$(this).next().toggleClass 'show-subnav'

+      open = $this.next().hasClass 'show-subnav'
+
+
+      if !open
+        $this.next().addClass 'show-subnav'