Refactor PersonSearch and create PersonACLAwareRepository

The search api delegates the query to a person acl aware "repository"
(although this does not implements ObjectRepository interface).

src/Bundle/ChillMainBundle/ChillMainBundle.php

@@ -3,6 +3,7 @@
 namespace Chill\MainBundle;
 
 use Chill\MainBundle\Routing\LocalMenuBuilderInterface;
+use Chill\MainBundle\Search\SearchInterface;
 use Chill\MainBundle\Security\Resolver\CenterResolverInterface;
 use Symfony\Component\HttpKernel\Bundle\Bundle;
 use Symfony\Component\DependencyInjection\ContainerBuilder;