INIT : spring architecture

- HomeController example
- ErrorController with 404 handling

- WepMapping for controller @RequestMapping
- ErrorMapping for ErrorController @RequestionMapping and way-around
    sitemesh known bug with errors
- Views Enum to link with .jsp pages

- Use of sitemesh and a template

- slf4j and log4j -> to use logging declare this Class variable:
        private Logger logger = LoggerFactory.getLogger(getClass());
    then use logger.method() (use autocompletion and google if needed)

- Unit test to check Jsp pages exist in Views Enum
- Unit test to HomeController with WebApplicationContext configuration
- Unit tests to ErrorController