Added project type to composer.json
Added project type to composer.json

Some IDE plugins like https://github.com/pulse00/Composer-Eclipse-Plugin show filtered composer packages by the type project in their project wizards.

This PR will make the Knp Rad edition show up in these dialogs.
KnpLabs/rad-edition,KnpLabs/rad-edition,KnpLabs/rad-edition,KnpLabs/rad-edition