merged branch igorw/app-parent-constructor (PR #572)

This PR was merged into the master branch.

Commits
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44ba6e72 Call parent constructor in app, to initialize pimple

Discussion
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Call parent constructor in app, to initialize pimple

src/Silex/Application.php

@@ -60,6 +60,8 @@ class Application extends \Pimple implements HttpKernelInterface, TerminableInte
      */
     public function __construct(array $values = array())
     {
+        parent::__construct();
+
         $app = $this;
 
         $this['logger'] = null;