Upgrade SBT to 0.13.5
Upgrade to 2.11.2 by default
Upgrade to Scalaz 7.1.0
Rename pirate.test to pirate.spec

This is partly to work around the clash with scalaz.test
Merge pull request #19 from markhibberd/topic/scalaz-7.1

Upgrade to Scalaz 7.1.0