Resolve "Introduce PSR-4 autoloading"

Closes #12

classes/Endpoint.php

@@ -8,7 +8,7 @@ class Endpoint
     private $sparqlUrl;
     private $params;
 
-    public function __construct($sparqlUrl, $params)
+    public function __construct($sparqlUrl, array $params)
     {
         $this->sparqlUrl = $sparqlUrl;
         $this->params = $params;
@@ -29,7 +29,7 @@ class Endpoint
         } elseif ($output == 'rdf') {
             $accept = 'application/rdf+xml';
         }
-        $aux = "";
+
         $modified = 0;
         $now = time();
         $cacheFile = "";