add Lens for Map.WithDefault

For when you don't need a PLens.
standalone Set membership lens

Similar to SetLensFamily.contains, but doesn't require input Lens.
Change Scalacheck URL to use Scaladoc syntax so generated HTML is valid
Implement traverseU_
Merge pull request #547 from refried/patch-10

add Lens for Map.WithDefault
Merge pull request #548

standalone Set membership lens
Merge pull request #556 from adelbertc/fix-scalacheck-url

Change Scalacheck URL to use Scaladoc syntax so generated HTML is valid
Merge pull request #558 from bmjames/traverseU_

Unapply version of traverse_
s/7.0.3/7.0.4
Prevent an unnecessary allocation on Either.getOrElse
Merge pull request #559 from japgolly/either

Prevent an unnecessary allocation on Either.getOrElse
relax constraint
prevent an unnecessary allocation Either.leftMap
make \&/ covariant
remove ToChoiceOps#ToComposeVFromKleisliLike and ToSplitOps#ToComposeVFromKleisliLike

see 244bdbc and dd33f59e4
add FromKleisliLike inference test
Migrated SIP-14 Futures from scalaz-contrib

Moved SIP-14 Future instances from scalaz-contrib to
scalaz-{core, effect}. Everything minus `forkIO` is in
`core`, `forkIO` is in effect.
removed deprecated Each instance for Future
renamed future to scalaFuture in effect
migrated tests for SIP-14 Future