[WIP] fix XML routing config
fix #620 plug parameters for classes where it missed some flexibility to override the class
Merge pull request #624 from xabbuh/fix-xml-routing

[WIP] fix XML routing config
Merge pull request #623 from cordoval/set-class-params-for-flexibility-on-configuration

[WCM] fix #620 plug parameters for classes where it missed some flexibility to override the class
set the matched media type as a request attribute
Merge pull request #621 from FriendsOfSymfony/media_type

set the matched media type as a request attribute