* add helper class .no-animation.

src/less/modules/animations.less

 /// ========================================================================
 /// Bootstrap: animations.less
 /// https://github.com/twbs/bootstrap/blob/master/less/component-animations.less
-/// 
+///
 /// ZUI: The file has been changed in ZUI. It will not keep update with the
 /// Bootsrap version in the future.
 /// http://zui.sexy
@@ -17,6 +17,15 @@
 // We don't use the `.opacity()` mixin here since it causes a bug with text
 // fields in IE7-8. Source: https://github.com/twitter/bootstrap/pull/3552.
 
+.no-animation,
+.no-animation:before,
+.no-animation:after,
+.no-animation *,
+.no-animation *:before,
+.no-animation *:after {
+  transition: none!important;
+}
+
 .fade {
   opacity: 0;
   .transition(opacity .15s linear);