Device stubs and exceptions added

lib/Exception/Handler/ConsoleHandler.php

@@ -0,0 +1,30 @@
+<?php
+
+namespace NoccyLabs\Gpio\Exception\Handler;
+
+use NoccyLabs\Gpio\Exception\GpioException;
+
+class ConsoleExceptionHandler
+{
+    protected $last;
+    
+    public function register()
+    {
+        $this->last = set_exception_handler( array($this, "onException") );
+    }
+    
+    public function onException(Exception $exception)
+    {
+        if (is_callable($this->last)) {
+            call_user_func($this->last, $exception);
+        }
+        if ($exception instanceof GpioException) {
+            $pin = $exception->getPin();
+            if ($pin) {
+                $pin->dumpState();
+            }
+        } 
+    }
+
+
+}