demo fix

Author: Alain Dumesny

demo/column.html

@@ -58,6 +58,7 @@ <h1>setColumn() grid demo</h1>
         {x: 4, y: 0, width: 4, height: 4},
         {text: ' auto'},
         */
+        {x: 0, y: 0, width: 2, height: 2},
         {x: 2, y: 0, width: 2, height: 1},
         {x: 5, y: 1, width: 1, height: 1},
         {x: 5, y: 0, width: 2, height: 1},