Use BehatExtension convention - closes laracasts#1

Author: JeffreyWay

readme.md

@@ -25,9 +25,9 @@ Next, within your project root, create a `behat.yml` file, and add:
 ```
 default:
     extensions:
-        Laracasts\Behat\ServiceContainer\LaravelExtension:
+        Laracasts\Behat:
             # env_path: .env.behat
-        Behat\MinkExtension\ServiceContainer\MinkExtension:
+        Behat\MinkExtension:
             default_session: laravel
             laravel: ~
 ```

src/ServiceContainer/LaravelExtension.php renamed to src/ServiceContainer/BehatExtension.php

@@ -10,7 +10,7 @@
 use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\Definition;
 
-class LaravelExtension implements Extension
+class BehatExtension implements Extension
 {
 
     /**