freeze bootstrap in version v2.3.2

vendor/assets/stylesheets/bootstrap/utilities.less

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+//
+// Utility classes
+// --------------------------------------------------
+
+
+// Quick floats
+.pull-right {
+  float: right;
+}
+.pull-left {
+  float: left;
+}
+
+// Toggling content
+.hide {
+  display: none;
+}
+.show {
+  display: block;
+}
+
+// Visibility
+.invisible {
+  visibility: hidden;
+}
+
+// For Affix plugin
+.affix {
+  position: fixed;
+}