remove submenus. for more context: http://www.youtube.com/watch?v=ggWyUEuGcWY&feature=youtu.be&t=48s

less/dropdowns.less

@@ -63,9 +63,7 @@
 // Hover/Focus state
 // -----------
 .dropdown-menu > li > a:hover,
-.dropdown-menu > li > a:focus,
-.dropdown-submenu:hover > a,
-.dropdown-submenu:focus > a {
+.dropdown-menu > li > a:focus {
   text-decoration: none;
   color: @dropdown-link-hover-color;
   #gradient > .vertical(@start-color: @dropdown-link-hover-bg; @end-color: darken(@dropdown-link-hover-bg, 5%));
@@ -153,64 +151,6 @@
   }
 }
 
-// Sub menus
-// ---------------------------
-.dropdown-submenu {
-  position: relative;
-}
-// Default dropdowns
-.dropdown-submenu > .dropdown-menu {
-  top: 0;
-  left: 100%;
-  margin-top: -6px;
-  margin-left: -1px;
-  border-top-left-radius: 0; // Nuke the closest corner as appropriate
-}
-.dropdown-submenu:hover > .dropdown-menu {
-  display: block;
-}
-
-// Dropups
-.dropup .dropdown-submenu > .dropdown-menu {
-  top: auto;
-  bottom: 0;
-  margin-top: 0;
-  margin-bottom: -2px;
-  border-bottom-left-radius: 0; // Nuke the closest corner as appropriate
-}
-
-// Caret to indicate there is a submenu
-.dropdown-submenu > a:after {
-  display: block;
-  content: " ";
-  float: right;
-  width: 0;
-  height: 0;
-  border-color: transparent;
-  border-style: solid;
-  border-width: 5px 0 5px 5px;
-  border-left-color: darken(@dropdown-bg, 20%);
-  margin-top: 5px;
-  margin-right: -10px;
-}
-.dropdown-submenu:hover > a:after {
-  border-left-color: @dropdown-link-hover-color;
-}
-
-// Left aligned submenus
-.dropdown-submenu.pull-left {
-  // Undo the float
-  // Yes, this is awkward since .pull-left adds a float, but it sticks to our conventions elsewhere.
-  float: none;
-
-  // Positioning the submenu
-  > .dropdown-menu {
-    left: -100%;
-    margin-left: 10px;
-    border-top-right-radius: 0; // Remove the rounded corner here
-  }
-}
-
 // Tweak nav headers
 // ---------------------------
 // Increase padding from 15px to 20px on sides