freeze bootstrap in version v2.3.2

vendor/assets/stylesheets/bootstrap/responsive-utilities.less

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+//
+// Responsive: Utility classes
+// --------------------------------------------------
+
+
+// IE10 Metro responsive
+// Required for Windows 8 Metro split-screen snapping with IE10
+// Source: http://timkadlec.com/2012/10/ie10-snap-mode-and-responsive-design/
+@-ms-viewport{
+  width: device-width;
+}
+
+// Hide from screenreaders and browsers
+// Credit: HTML5 Boilerplate
+.hidden {
+  display: none;
+  visibility: hidden;
+}
+
+// Visibility utilities
+
+// For desktops
+.visible-phone     { display: none !important; }
+.visible-tablet    { display: none !important; }
+.hidden-phone      { }
+.hidden-tablet     { }
+.hidden-desktop    { display: none !important; }
+.visible-desktop   { display: inherit !important; }
+
+// Tablets & small desktops only
+@media (min-width: 768px) and (max-width: 979px) {
+  // Hide everything else
+  .hidden-desktop    { display: inherit !important; }
+  .visible-desktop   { display: none !important ; }
+  // Show
+  .visible-tablet    { display: inherit !important; }
+  // Hide
+  .hidden-tablet     { display: none !important; }
+}
+
+// Phones only
+@media (max-width: 767px) {
+  // Hide everything else
+  .hidden-desktop    { display: inherit !important; }
+  .visible-desktop   { display: none !important; }
+  // Show
+  .visible-phone     { display: inherit !important; } // Use inherit to restore previous behavior
+  // Hide
+  .hidden-phone      { display: none !important; }
+}
+
+// Print utilities
+.visible-print    { display: none !important; }
+.hidden-print     { }
+
+@media print {
+  .visible-print  { display: inherit !important; }
+  .hidden-print   { display: none !important; }
+}