Added a test for retriable tasks, and accumulating errors.
Merge branch 'scalaz-seven' of https://github.com/scalaz/scalaz into scalaz-seven

Conflicts:
	tests/src/test/scala/scalaz/concurrent/TaskTest.scala
A data structure, based on These from scalaz-stream.
fix typo
update SBT and plugins
use sbt-unidoc plugin
update to Scala 2.10.2
Merge pull request #451 from larsrh/topic/update-sbt

update SBT & Scala versions
concurrent.ops.future moved, migrating naive strategy.