correct the Laravel bootstrap path

- fix the path for compatibility with L5 and Lumen
- assume the working dir is the application root
- throw an exception instead of failing silently

Author: Matt Allan

Bootstraps/Laravel.php

@@ -31,20 +31,28 @@ public function __construct($appenv)
     }
 
     /**
-     * Create a Symfony application
+     * Create a Laravel application
      */
     public function getApplication()
     {
-        if (file_exists(__DIR__ . '/autoload.php') && file_exists(__DIR__ . '/start.php')) {
-            require_once __DIR__ . '/autoload.php';
-            $this->app = require_once __DIR__ . '/start.php';
+        // Laravel 5 / Lumen
+        if (file_exists('bootstrap/app.php')) {
+            return $this->app = require_once 'bootstrap/app.php';
         }
 
-        return $this->app;
+        // Laravel 4
+        if (file_exists('bootstrap/start.php')) {
+            require_once 'bootstrap/autoload.php';
+            return $this->app = require_once 'bootstrap/start.php';
+        }
+
+        throw new \RuntimeException('Laravel bootstrap file not found');
     }
 
     /**
      * Return the StackPHP stack.
+     * @param Builder $stack
+     * @return Builder
      */
     public function getStack(Builder $stack)
     {