Added windowing processes.
Merge branch 'master' of https://github.com/scalaz/scalaz-stream

Conflicts:
	src/main/scala/scalaz/stream/Process.scala
Merge pull request #21 from Spinoco/async-pr

added sink to signal
Added cobind to Process
Added foldMap
Fixed up foldMap
fixed bytes so the toArray honours actual size of underlying array
Merge branch 'master' of github.com:scalaz/scalaz-stream into main-master
Merge branch 'refs/heads/main-master'