cleaned up gpio and device code, implemented dummy/dry run mode

examples/pcd8544.php

@@ -0,0 +1,24 @@
+<?php
+
+require_once __DIR__."/../vendor/autoload.php";
+
+NoccyLabs\Crap\Crap::activate();
+
+use NoccyLabs\Gpio\Gpio;
+use NoccyLabs\Gpio\Device\Display\Pcd8544Device;
+
+$gpio = new Gpio(true);
+$lcd = new Pcd8544Device;
+
+$lcd
+    // we can rename devices as we like, to help in debugging
+    ->setName("pcd8544_1")
+    ->setPin("sda", $gpio[0])
+    ->setPin("scl", $gpio[1])
+    ->setPin("res", $gpio[2])
+    ->setPin("sce", $gpio[3])
+    ->setPin("dc",  $gpio[4])
+    ->initialize()
+    ;
+
+