lib/nitcorn: introduces vararg_routes module

This will allow the creation of parameterized routes like `/users/:id`.

Signed-off-by: Alexandre Terrasa <alexandre@moz-code.org>
llib/nitcorn: fixes documentation warnings.

Signed-off-by: Alexandre Terrasa <alexandre@moz-code.org>
lib/nitcorn: handles uri parameters in reactor

Signed-off-by: Alexandre Terrasa <alexandre@moz-code.org>
exemples/nitcorn: rename MyAction class by StaticAction.

Signed-off-by: Alexandre Terrasa <alexandre@moz-code.org>
lib/nitcorn: introduces a second action to show uri parameters usage

Signed-off-by: Alexandre Terrasa <alexandre@moz-code.org>
lib/nitcorn: updates README

Signed-off-by: Alexandre Terrasa <alexandre@moz-code.org>