Fixed installation.rst per rande's Notes.
Fixed installation.rst per rande's Notes.

vyshkant/SonataMediaBundle,bgaleotti/SonataMediaBundle,nicolasricci/SonataMediaBundle,jerome-fix/SonataMediaBundle,Soullivaneuh/SonataMediaBundle,nicolasricci/SonataMediaBundle,rmzamora/SonataMediaBundle,hug963/SonataMediaBundle,bgaleotti/SonataMediaBundle,hug963/SonataMediaBundle,vyshkant/SonataMediaBundle,Soullivaneuh/SonataMediaBundle,Soullivaneuh/SonataMediaBundle,nicolasricci/SonataMediaBundle,OskarStark/SonataMediaBundle,OskarStark/SonataMediaBundle,vyshkant/SonataMediaBundle,jerome-fix/SonataMediaBundle,nicolasricci/SonataMediaBundle,rmzamora/SonataMediaBundle,vyshkant/SonataMediaBundle,jerome-fix/SonataMediaBundle,OskarStark/SonataMediaBundle,rmzamora/SonataMediaBundle,vyshkant/SonataMediaBundle,nicolasricci/SonataMediaBundle,hug963/SonataMediaBundle,hug963/SonataMediaBundle,jerome-fix/SonataMediaBundle,bgaleotti/SonataMediaBundle,sonata-project/SonataMediaBundle,OskarStark/SonataMediaBundle,Soullivaneuh/SonataMediaBundle,Soullivaneuh/SonataMediaBundle,hug963/SonataMediaBundle,bgaleotti/SonataMediaBundle