Renamed all files from Uri to Url
Renamed all references of Url to Uri
Merge pull request #9 from symfony-cmf/renamed_url_to_uri

Renamed url to uri
Added HHVM to Travis
Added validation for YAML keys
fix dependencies to allow for some sane flexibility
Merge pull request #10 from symfony-cmf/hhvm-patch

Added HHVM to Travis
Merge pull request #11 from symfony-cmf/validate_yml_schema

Added validation for YAML keys
Merge pull request #13 from symfony-cmf/fix_dependencies

fix dependencies to allow for some sane flexibility
Added test for circular PHP reference
Fixed multiple inheritance
Removed wrong circular reference exception
Method name fix