Support for hovering on cell's with state

If parent row are hovered, child cell with state should react to this.

less/mixins/table-row.less

@@ -20,6 +20,7 @@
     > td.@{state}:hover,
     > th.@{state}:hover,
     &.@{state}:hover > td,
+    &:hover > .@{state},
     &.@{state}:hover > th {
       background-color: darken(@background, 5%);
     }