Merge pull request #343 from mrsid18/master

Add format method to Number Column.

Author: thyseus

src/NumberColumn.php

@@ -18,4 +18,13 @@ public function round($places = 0)
 
         return $this;
     }
+
+    public function format($places = 0)
+    {
+        $this->callback = function ($value) use ($places) {
+            return number_format($value, $places, '.', ',');
+        };
+
+        return $this;
+    }
 }