compile under 2.11.0-M4

* add a couple of explicit type parameters
* make some extractors `val`s instead of `def`s
deprecate Validation#flatMap
7.1.0 → 7.1 in deprecation warnings
sequence_ syntax
seal and classify scalaz.concurrent.Future
fix MapTest: make equality non-natural
merge test classes for std.Map
rename `DataMapTest` to `MapTest`
Fix #489: pattern match in `Future.listen` is safe

`step` is guaranteed to remove `BindSuspend` and `Suspend`