merged branch vicb/di/prepext (PR #6853)

This PR was merged into the master branch.

Commits
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7944860 [DIC] Move PrependExtensionInterface to the Extension namespace

Discussion
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[DIC] Move PrependExtensionInterface to the Extension namespace

@fabpot Please merge before 2.2 (no BC break) /cc @lsmith77

src/Symfony/Component/DependencyInjection/Compiler/MergeExtensionConfigurationPass.php

@@ -12,6 +12,7 @@
 namespace Symfony\Component\DependencyInjection\Compiler;
 
 use Symfony\Component\DependencyInjection\ContainerBuilder;
+use Symfony\Component\DependencyInjection\Extension\PrependExtensionInterface;
 
 /**
  * Merges extension configs into the container builder

src/Symfony/Component/DependencyInjection/Extension/PrependExtensionInterface.php

@@ -9,7 +9,7 @@
  * file that was distributed with this source code.
  */
 
-namespace Symfony\Component\DependencyInjection\Compiler;
+namespace Symfony\Component\DependencyInjection\Extension;
 
 use Symfony\Component\DependencyInjection\ContainerBuilder;