bug #757 Use getRootDir() rather than assuming __DIR__ (thewilkybarkid)

This PR was merged into the 2.3 branch.

Discussion
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Use getRootDir() rather than assuming __DIR__

In the event that `getRootDir()` in `AppKernel` is overridden (eg the file is moved elsewhere but the config etc stays put), the `registerContainerConfiguration` would also have to be changed.

Commits
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36ab0c1 Use getRootDir() rather than assuming __DIR__

Author: fabpot

app/AppKernel.php

@@ -31,6 +31,6 @@ public function registerBundles()
 
     public function registerContainerConfiguration(LoaderInterface $loader)
     {
-        $loader->load(__DIR__.'/config/config_'.$this->getEnvironment().'.yml');
+        $loader->load($this->getRootDir().'/config/config_'.$this->getEnvironment().'.yml');
     }
 }