Play22

I found your blog post about iteratees and scalaz-stream very helpful and tried to convert the sample project to play 2.2.2. It already starts to run and the simpler use cases seem to do what they are supposed to do, however the recursive examples seem to fail.

I mostly only did minor changes as I am by no means an expert with scalaz-stream but maybe you could have a look to get the examples working again, before eventually merging the PR.

I forgot to mention one change in the commit: I replaced `Process(...) then Process(...)` with `append`

Thanks Markus