Iteratee version bump: 2.1.0 -> 2.1.5
Upgrade to play iteratees 2.2.0
Benchmark raw task vs. iteratee performance.
Merge remote-tracking branch 'origin/develop' into topic/scalaz-task

Conflicts:
	core/src/main/scala/org/http4s/BodyParser.scala
	core/src/main/scala/org/http4s/Writable.scala
	project/Dependencies.scala