Unique namespace within a mount

[milkamil93]

Example:

$router->mount('/api/v1', function () use ($router) {
    $router->setNamespace('Source\Api\v1');
    $router->mount('/test', function () use ($router) {
        $router->setNamespace('Source\Api\v1\Test');
    });
});

[uvulpos]

LGTM if it works (did not test that yet), but please add some unit tests 😉 that would be icing on the cake 👍🏻

[milkamil93]

LGTM if it works (did not test that yet), but please add some unit tests 😉 that would be icing on the cake 👍🏻

https://github.com/bramus/router/pull/158/commits/75d5c6e13c836b3a961194ac6f48a794280639b0