fixed the RngArbitraries which was reverted by the previous merge
using the latest scalacheck
removed deprecated scalacheck calls
using the latest scalacheck
# This is a combination of 2 commits.
# The first commit's message is:

using the latest scalacheck

# This is the 2nd commit message:

removed deprecated scalacheck calls
merged with master
reverted to specs2 2.3.2 for testing until there is a version of scalaz-scalacheck-bindings supporting scalacheck 1.11.3