Added 2 new layers: HttpResponseCodeLayer and RedirectionFromBagLayer

- HttpResponseCodeLayer just easily set an HTTP response code
- RedirectionFromBagLayer let you redirect the user for a given action
result, but will seek the path to redirect to in the bag
Fix ExecutorExtendedLayer : correctly set the action result in the bag
Removed the not needed (useless) http response code layer.
Correctly set HTTP result code 302 when redirecting
Template Renderer no longer requires the ResponseBag to render a template
Raise a TemplateNotFoundException when no template is found instead of RuntimeException
Codestyle
Removed double render definition
Merge pull request #9 from Evaneos/redirection-and-http-response-layers

Redirection and HTTP response layers