Add missing namespace (#1085)

* Add Missing namespace

Missing Grid namespace on ExcelExport Class

* Update XMLExport.php

* Update JSONExport.php

Author: Thierrygen

Grid/Export/ExcelExport.php

@@ -12,6 +12,8 @@
 
 namespace APY\DataGridBundle\Grid\Export;
 
+use APY\DataGridBundle\Grid\Grid;
+
 /**
  * Excel (This export produces a warning with new Office Excel).
  */

Grid/Export/JSONExport.php

@@ -12,6 +12,8 @@
 
 namespace APY\DataGridBundle\Grid\Export;
 
+use APY\DataGridBundle\Grid\Grid;
+
 /**
  * JSON.
  */

Grid/Export/XMLExport.php

@@ -15,6 +15,7 @@
 use Symfony\Component\Serializer\Encoder\XmlEncoder;
 use Symfony\Component\Serializer\Normalizer\GetSetMethodNormalizer;
 use Symfony\Component\Serializer\Serializer;
+use APY\DataGridBundle\Grid\Grid;
 
 /**
  * XML.