fix: autoloading to work in both phar/composer contexts

Makefile

@@ -1,5 +1,8 @@
 phar: phar-composer.phar
 	php -d phar.readonly=off phar-composer.phar build niktux/karma
 
+local-phar: phar-composer.phar
+	php -d phar.readonly=off phar-composer.phar build .
+
 phar-composer.phar:
-	wget https://github.com/clue/phar-composer/releases/download/v1.0.0/phar-composer.phar
+	wget -q https://github.com/clue/phar-composer/releases/download/v1.0.0/phar-composer.phar

karma

@@ -1,7 +1,17 @@
 #!/usr/bin/env php
 <?php
 
-require __DIR__ . '/vendor/autoload.php';
+// Karma can be installed by phar or by composer (deprecated). Autoload.php is located differently in these cases
+// Phar location needs to be tested first (__DIR__ is equals to phar://...)
+$locations = [__DIR__ . '/vendor/autoload.php', __DIR__ . '/../../autoload.php'];
+foreach($locations as $file)
+{
+    if (file_exists($file))
+    {
+        require $file;
+        break;
+    }
+}
 
 $console = new Karma\Console(new Karma\Application());
 $console->run();