update collapsible nav in navbar

docs/assets/css/bootstrap-responsive.css

@@ -218,7 +218,7 @@
     position: static;
     margin-bottom: 18px;
   }
-  .navbar-inner {
+  .navbar-fixed-top .navbar-inner {
     padding: 5px;
     background-image: none;
   }
@@ -305,10 +305,13 @@
   .btn-navbar {
     display: block;
   }
-  .nav-collapse {
+  .nav-collapse.collapse {
     overflow: hidden;
     height: 0;
   }
+  .nav-collapse.collapse.in {
+    height: auto;
+  }
 }
 @media (min-width: 1200px) {
   .thumbnails {

docs/assets/css/bootstrap.css

@@ -2396,7 +2396,7 @@ button.btn.small, input[type="submit"].btn.small {
   margin-top: 3px;
 }
 .nav-collapse.collapse {
-  height: auto !important;
+  height: auto;
 }
 .navbar .brand:hover {
   text-decoration: none;