Updated bootstrap files

assets/css/bootstrap-responsive.css

 /*!
- * Bootstrap Responsive v2.2.1
+ * Bootstrap Responsive v2.3.1
  *
  * Copyright 2012 Twitter, Inc
  * Licensed under the Apache License v2.0
@@ -40,6 +40,10 @@
           box-sizing: border-box;
 }
 
+@-ms-viewport {
+  width: device-width;
+}
+
 .hidden {
   display: none;
   visibility: hidden;
@@ -91,6 +95,19 @@
   }
 }
 
+.visible-print {
+  display: none !important;
+}
+
+@media print {
+  .visible-print {
+    display: inherit !important;
+  }
+  .hidden-print {
+    display: none !important;
+  }
+}
+
 @media (min-width: 1200px) {
   .row {
     margin-left: -30px;
@@ -999,7 +1016,9 @@
     margin-bottom: 2px;
   }
   .nav-collapse .nav > li > a:hover,
-  .nav-collapse .dropdown-menu a:hover {
+  .nav-collapse .nav > li > a:focus,
+  .nav-collapse .dropdown-menu a:hover,
+  .nav-collapse .dropdown-menu a:focus {
     background-color: #f2f2f2;
   }
   .navbar-inverse .nav-collapse .nav > li > a,
@@ -1007,7 +1026,9 @@
     color: #999999;
   }
   .navbar-inverse .nav-collapse .nav > li > a:hover,
-  .navbar-inverse .nav-collapse .dropdown-menu a:hover {
+  .navbar-inverse .nav-collapse .nav > li > a:focus,
+  .navbar-inverse .nav-collapse .dropdown-menu a:hover,
+  .navbar-inverse .nav-collapse .dropdown-menu a:focus {
     background-color: #111111;
   }
   .nav-collapse.in .btn-group {