Bind instance for scala.Map
Bind instance for scalaz.==>>

https://github.com/ekmett/semigroupoids/blob/v4.0/src/Data/Functor/Bind.hs#L472-L474
add test for `scalaz.==>>`
add test for `scala.Map`
Merge pull request #584 from xuwei-k/map-bind

add Map Bind instance
deprecated StackLens and StackLensFamily

https://github.com/scala/scala/commit/3cc99d7b4aa43b1#diff-25
https://github.com/scala/scala/blob/v2.11.0-M7/src/library/scala/collection/immutable/Stack.scala#L50
Merge pull request #588 from xuwei-k/deprecated-stack

deprecated StackLens and StackLensFamily
update Scala 2.11.0-M7
Merge pull request #589 from xuwei-k/2110-M7

update Scala 2.11.0-M7
Added foldMap for Free
Added foldRight for Free