Add KernelBrowser stub

Fixes #216

Author: b1rdex

Diff for: extension.neon

@@ -9,6 +9,7 @@ parameters:
 		constant_hassers: true
 		console_application_loader: null
 	stubFiles:
+		- stubs/Symfony/Bundle/FrameworkBundle/KernelBrowser.stub
 		- stubs/Symfony/Bundle/FrameworkBundle/Test/KernelTestCase.stub
 		- stubs/Symfony/Bundle/FrameworkBundle/Test/TestContainer.stub
 		- stubs/Symfony/Component/Form/ChoiceList/Loader/ChoiceLoaderInterface.stub

Diff for: stubs/Symfony/Bundle/FrameworkBundle/KernelBrowser.stub

@@ -0,0 +1,13 @@
+<?php
+
+namespace Symfony\Bundle\FrameworkBundle;
+
+use Symfony\Bundle\FrameworkBundle\Test\TestContainer;
+
+abstract class KernelBrowser
+{
+    /**
+     * @return TestContainer
+     */
+    abstract public function getContainer();
+}