Redesign all the router

All WordPress options done
Improved default waterfalls
Now is YAML strict: 404 response if there isn't any route for that request
Simplified matching
Some minor fixes
Restructured directory structure
Removed ResolverInterface and become Resolver as abstract class
Added initial CHANGELOG
Installed and configured php-cs-fixer
Built PhpSpec infrastructure and added some initial specs
Added editorconfig
Added Travis