Upgraded bootstrap to 3.3.4

src/UI/Content/Bootstrap/component-animations.less

@@ -5,7 +5,7 @@
 // Heads up!
 //
 // 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.
+// fields in IE7-8. Source: https://github.com/twbs/bootstrap/pull/3552.
 
 .fade {
   opacity: 0;
@@ -17,13 +17,17 @@
 
 .collapse {
   display: none;
-  &.in {
-    display: block;
-  }
+
+  &.in      { display: block; }
+  tr&.in    { display: table-row; }
+  tbody&.in { display: table-row-group; }
 }
+
 .collapsing {
   position: relative;
   height: 0;
   overflow: hidden;
-  .transition(height .35s ease);
+  .transition-property(~"height, visibility");
+  .transition-duration(.35s);
+  .transition-timing-function(ease);
 }