[OPTIMISATION] Optimisations + bugfixes.

- Fixed references to Pecee framework.
- Fixed variables not being initialised before usage.
- Cleaned up duplicate checks.
- Other small optimisations and bugfixes.

src/Pecee/Http/Response.php

@@ -26,7 +26,7 @@ class Response {
     }
 
     public function refresh() {
-        $this->redirect(url());
+        $this->redirect(Request::getInstance()->getUri());
     }
 
     /**