Merge branch 'hotfix/2700' into develop

Forward port zendframework/zendframework#2700

src/Page/AbstractPage.php

@@ -767,7 +767,7 @@ public function setVisible($visible = true)
         if (is_string($visible) && 'false' == strtolower($visible)) {
             $visible = false;
         }
-        $this->visible = (bool)$visible;
+        $this->visible = (bool) $visible;
         return $this;
     }