@uri /resource/:id/:childId are handled incorrectly

[andrew-makarenko]

resources @uri /resource/:id/:childId are handled incorrectly
Scenario:
I have a resource with:
@uri /resource/:id/:childId
And a handler
public function put( $id, $childId = '' ) {}
Do a request /resource/1/
Expected behavior:
Variables $id is equal to "1", variable $childId is equal to empty string ''

But the recent commit (4f6f9f0) break this, and we got these values:
$id = 1, $childId = 1.

[andrew-makarenko]

Fix: #169

[dmitriy-poletayev]

Please, push this to branch.