nuke bg image on active/open for buttons for when we add gradients

less/buttons.less

@@ -35,6 +35,7 @@
   &:active,
   &.active {
     outline: 0;
+    background-image: none;
     .box-shadow(inset 0 3px 5px rgba(0,0,0,.125));
   }
 

less/mixins.less

@@ -418,7 +418,11 @@
     background-color: darken(@background, 8%);
         border-color: darken(@border, 12%);
   }
-
+  &:active,
+  &.active,
+  .open .dropdown-toggle& {
+    background-image: none;
+  }
   &.disabled,
   &[disabled],
   fieldset[disabled] & {