Add adapter for akka-flows

Allows to feed a scalaz-Process into an akka-Flow.
Upgrades

- Scala 2.11.2
- Scalaz 7.1.0
- scalaz-stream 0.5a
- Akka 2.3.5
Started akka-stream combinators section in docs
Managed flows
Remove streamz-util
Flow consumer
Upgrade to akka-stream 0.6
Set development version to 0.2-SNAPSHOT
Link to scalaz-camel