WSF_RESPONSE.write_..' by using the up-to-date
- added RFC1123 http date format helper - added put_cookie_with_expiration_date as DATE_TIME REQUEST: added `execution_variable' to provide a way to keep object attached to the request and indexed by a string. A typical usage is a SESSION object
Move hello_routed_world under tests/dev since it was not really an example, but more a dev workspace/test