Padrino 0.12.0 is available

Update the code about named_routes
named_route was modified in https://github.com/padrino/padrino-framework/pull/1481
and https://github.com/padrino/padrino-framework/commit/9ee11435c125b5c28dc520b47052686b940943d8
Drop padrino-0.11.x
Merge pull request #8 from namusyaka/bump-padrino-version

Padrino 0.12.0 is available