Update README for use with latest Symfony2 helper style
Update README for use with latest Symfony2 helper style

helmer/GravatarBundle,wwotoole/GravatarBundle,ornicar/GravatarBundle,piotrantosik/GravatarBundle,Soullivaneuh/GravatarBundle,nurikabe/GravatarBundle,dVelopment/GravatarBundle,lemoinem/GravatarBundle,Herzult/GravatarBundle,henrikbjorn/GravatarBundle,bzikarsky/GravatarBundle,benji07/GravatarBundle