[Feature] Add support for @ParamConverter in LinkRequestListener

The `@ParamConverter` annotation, and other request variable modifying annotations are often used in REST APIs.
Most, if not all, of those annotations hook on to the `kernel.controller` event to do their jobs.
By emitting such event in the `LinkRequestListener`, the arguments to the controller are modified, and the developer does not have to care if their actions are called by this listener, or from an external request.

Please let me know if you are interested in this feature addition, then I'll update the docs and add some tests.

Refs: willdurand/willdurand.github.com#21