Tidy ViewResponseListener and tests
add test
its instanceof it seems
Configuration to turn off copying of default variables
PHP 5.3isms for test case
Fix missed variable rename
Merge pull request #576 from merk/fill-default-template-vars

[Proposal] Configuration to disable copying of default template variables
Fix form error response code
Adapt the status text with correct reponse code
Merge pull request #578 from ASKozienko/bug-form-error-response-code

Invalid Code For Form Errors
removed test
Merge pull request #581 from tonivdv/bug-form-error-response-code

Fixed: bug form error response code
only call setSerializeNull if its not yet explicitly set (fixes #573)
Merge pull request #582 from FriendsOfSymfony/fix_573

only call setSerializeNull if its not yet explicitly set