[sluggable] Fix ODM integer type

lib/Gedmo/Sluggable/Mapping/Driver/Annotation.php

@@ -36,7 +36,8 @@ class Annotation implements AnnotationDriverInterface
     private $validTypes = array(
         'string',
         'text',
-        'integer'
+        'integer',
+        'int'
     );
 
     /**

lib/Gedmo/Sluggable/Mapping/Driver/Xml.php

@@ -29,7 +29,8 @@ class Xml extends BaseXml
     private $validTypes = array(
         'string',
         'text',
-        'integer'
+        'integer',
+        'int'
     );
 
     /**

lib/Gedmo/Sluggable/Mapping/Driver/Yaml.php

@@ -35,6 +35,7 @@ class Yaml extends File implements Driver
         'string',
         'text',
         'integer',
+        'int'
     );
 
     /**