[FrameworkBundle] Set the file storage as default storage for Symfony2

Author: alexandresalome

DependencyInjection/Configuration.php

@@ -117,7 +117,7 @@ private function addProfilerSection(ArrayNodeDefinition $rootNode)
                     ->children()
                         ->booleanNode('only_exceptions')->defaultFalse()->end()
                         ->booleanNode('only_master_requests')->defaultFalse()->end()
-                        ->scalarNode('dsn')->defaultValue('sqlite:%kernel.cache_dir%/profiler.db')->end()
+                        ->scalarNode('dsn')->defaultValue('file:%kernel.cache_dir%/profiler')->end()
                         ->scalarNode('username')->defaultValue('')->end()
                         ->scalarNode('password')->defaultValue('')->end()
                         ->scalarNode('lifetime')->defaultValue(86400)->end()