Enhanced timed Future so it would not block the Future`s execution thread pool, but instead will use scheduled executor to notify timeout.
add TheseOps
Merge pull request #493 from Spinoco/scalaz-seven-contrib

Enhanced timed Future so it would not block the Future`s execution threa...
use reverse_:::
Remove Zip[[a]These[X, a]]; it is unlawful.
Add &&& as a proper name for These#zip.
Deprecate These#zip; the name implies the existence of a lawful instance.
add TheseOps#this TheseOps#that
add ThesePairOps
Merge pull request #495 from xuwei-k/these-ops

add TheseOps
Promote arbitrary ==>> to scalacheck-binding.
Test soundness (order preservation) of a few ==>> operations. (union fails)
Symmetricity and more idempotence tests.
More ==>> difference tests.
Implementing the :<: (inject) type class
Adding Scala 2.9.3 support
fix CoproductInstances. add Equal instanse
CoproductArbitrary
add CoproductTest
add UnwriterTTest