Armed the gpio class

lib/Gpio.php

@@ -28,13 +28,15 @@ class Gpio implements \ArrayAccess
     /** @var NoccyLabs\Gpio\GpioMapperInterface */
     protected $mapper;
     
-    public function __construct()
+    public function __construct($force=false)
     {
-        if (!file_exists("/sys/class/gpio")) {
-            throw new HardwareException("gpio sysfs is not available");
-        }
-        if (!is_writable("/sys/class/gpio/export")) {
-            throw new HardwareException("gpio sysfs is not writable");
+        if (!$force) {
+            if (!file_exists("/sys/class/gpio")) {
+                throw new HardwareException("gpio sysfs is not available");
+            }
+            if (!is_writable("/sys/class/gpio/export")) {
+                throw new HardwareException("gpio sysfs is not writable");
+            }
         }
     }