updated entity update

sites/all/modules/contrib/dev/entity/entity.install

@@ -13,6 +13,14 @@ function entity_enable() {
   entity_entitycache_installed_modules();
 }
 
+/**
+ * Implements hook_uninstall().
+ */
+function entity_uninstall() {
+  // Delete variables.
+  variable_del('entity_rebuild_on_flush');
+}
+
 /**
  * The entity API modules have been merged into a single module.
  */