Added random integer attribute

Attribute allows specific length to be returned using e.g
integer|8
returns 33166023

src/Zizaco/FactoryMuff/FactoryMuff.php

@@ -191,6 +191,14 @@ private function generateAttr( $kind, $model = NULL )
             }
         }
 
+        if ( is_string($kind) && substr( $kind, 0, 8 ) === 'integer|' ) {
+            $numgen = substr( $kind, 8 );
+
+            for ( $i=0; $i<$numgen; $i++ ) {
+                $result .= mt_rand(0,9);
+            }
+        }
+
         // Overwise interpret the kind and 'generate' some
         // crap.
         switch ( $kind ) {