remove references because classes and ressources won't be copied

Author: gregor-j

src/AbstractFunction.php

@@ -41,12 +41,12 @@ abstract class AbstractFunction implements IFunction
 
     /**
      * Initialize this class with a connection instance and the function name.
-     * @param mixed $connection Referenced connection ressource.
+     * @param mixed $connection Connection ressource/class
      * @param string $name
      */
-    public function __construct(&$connection, $name)
+    public function __construct($connection, $name)
     {
-        $this->connection = &$connection;
+        $this->connection = $connection;
         $this->name = $name;
         $this->reset();
     }

src/AbstractRemoteFunctionCall.php

@@ -104,7 +104,7 @@ public function invoke($params = null)
      * @throws \phpsap\interfaces\exceptions\IConnectionFailedException
      * @throws \phpsap\interfaces\exceptions\IUnknownFunctionException
      */
-    protected function &getFunction()
+    protected function getFunction()
     {
         if ($this->function === null) {
             //now connect and prepare the function