bugfixes to gpiopin

lib/GpioPin.php

@@ -45,7 +45,7 @@ class GpioPin
     public function __construct($pin)
     {
         $this->pin = (int)$pin;
-        $this->fd = fopen("/sys/class/gpio/gpio{$pin}/value", "rb");
+        $this->export();
     }
     
     public function __destruct()