Ensured a consistent default error reporting level for PHP 5.4 and 5.5

E_ALL includes E_STRICT as of PHP 5.5 but it was not the case in PHP 5.3
and 5.4. The default value for the error reporting now includes E_STRICT
for all versions to be consistent.

src/Behat/Testwork/Call/ServiceContainer/CallExtension.php

@@ -74,7 +74,7 @@ public function configure(ArrayNodeDefinition $builder)
         $builder
             ->addDefaultsIfNotSet()
             ->children()
-                ->scalarNode('error_reporting')->defaultValue(E_ALL)
+                ->scalarNode('error_reporting')->defaultValue(E_ALL | E_STRICT)
             ->end()
         ;
     }