DATAREST-381 - Improved HandlerMapping infrastructure to make sure controllers consider base URI.

Removed class-level @RequestMapping annotations as the controllers get picked up by standard Spring MVC and are exposed via the root even if a base URI is configured. Created custom @BaseUriAwareController and use that in AlpsController to make sure it doesn't get picked up by Spring MVC.
DATAREST-380 - Removed obsolete repository declaration.