Merge pull request #16174 from twbs/bang_table_utility

Update .visible* classes to use !important on table elements

less/mixins/responsive-visibility.less

@@ -4,7 +4,7 @@
 // More easily include all the states for responsive-utilities.less.
 .responsive-visibility() {
   display: block !important;
-  table&  { display: table; }
+  table&  { display: table !important; }
   tr&     { display: table-row !important; }
   th&,
   td&     { display: table-cell !important; }