Fixed typos, added pinmap example to dump map

examples/pinmap.php

@@ -0,0 +1,17 @@
+<?php
+
+require_once __DIR__."/../vendor/autoload.php";
+
+use NoccyLabs\Gpio\GpioMapper\WiringPiMapper;
+use NoccyLabs\Gpio\Exception\GpioException;
+
+$mapper = new WiringPiMapper(2);
+
+$pin = 0;
+try {
+	while (($gpio = $mapper->mapLogicalToGpioPin($pin))) {
+		printf(" %3d = GPIO%d \n", $pin, $gpio);
+		$pin++;
+	}
+} catch (GpioException $e) {
+}