Added software spi stuff

lib/GpioPin.php

@@ -52,8 +52,6 @@ class GpioPin
     {
         $this->pin = (int)$pin;
         $this->gpio = $gpio;
-        $this->export();
-        $this->hardware = $this->findHardware();
     }
     
     private function findHardware()
@@ -139,6 +137,7 @@ class GpioPin
         if (!file_exists("/sys/class/gpio/gpio{$this->pin}")) {
             throw new HardwareException("Unable to export pin {$this->pin}");
         }
+        $this->hardware = $this->findHardware();
         return $this;
     }