Accept Column object through setColumns.

Select->setColumns was limited to accept string... having it accept Column type object
extends ability to add complex functions or manipulations.

Author: prasad83

src/Syntax/SyntaxFactory.php

@@ -35,6 +35,8 @@ public static function createColumns(array &$arguments, $table = null)
                     $column->setAlias($index);
                 }
 
+                $createdColumns[] = $column;
+            } else if ($column instanceof Column) {
                 $createdColumns[] = $column;
             }
         }