Fix invalid path to autoloader when using mo with composer (#54)

Fixes #30.

See PR #46 from Learnosity/bug-invalid-path-to-mo

Commits included:

* Incorrect path in `mo` pointing to vendor folder

(cherry picked from commit 7ae40ac)

bin/mo

@@ -1,7 +1,28 @@
 #!/usr/bin/env php
 <?php
 
-require __DIR__ . '/../vendor/autoload.php';
+foreach (
+    [
+        __DIR__ . '/../../../../vendor/autoload.php',
+        __DIR__ . '/../../autoload.php',
+        __DIR__ . '/../vendor/autoload.php',
+        __DIR__ . '/vendor/autoload.php'
+    ] as $file
+) {
+    if (file_exists($file)) {
+        define('AUTOLOAD_PATH', $file);
+        break;
+    }
+}
+
+unset($file);
+
+if (!defined('AUTOLOAD_PATH')) {
+    fwrite(STDERR, 'Cannot find the Composer autoloader' . PHP_EOL . PHP_EOL);
+    die();
+}
+
+require_once AUTOLOAD_PATH;
 
 use LearnosityQti\Commands\ConvertToLearnosityCommand;
 use LearnosityQti\Commands\ConvertToQtiCommand;