Adding a link to the HautelookAliceBundle screencast

Hey @baldurrensch!

I've started using your bundle in trainings and we've also made a small (and free) screencast about it: https://knpuniversity.com/screencast/alice-fixtures. I think this approach to fixtures is just great and the whole thing is really easy to use. Side-note, the one difficulty I see for new people is that - since there are so many libraries being integrated (Alice, Faker, DoctrineFixturesBundle), they're not immediately sure what the bundle actually does. But then they *love* it :).

Anyways, I don't know if you'd accept an external link like this. I think it would be helpful, but I'm biased. No hard-feeling either way.

Cheers and thanks!