Added groupBy1 and renamed groupByM to groupWhenM
Re-added groupByM with deprecation message
Added ability to "filter" validations based on the result of a partial function
tuned
Merge pull request #360
Added fold(Right/Left)1Opt and fold(r/l)1Opt
tuned: shorter implementation of `foldMap1Opt`, better tests
Merge pull request #362
Merge pull request #361 from oxbowlakes/groupBy1

Added groupBy1 and renamed groupByM to groupWhenM
Adds mapM to StreamT

mapM threads a per-element monadic effect through the stream
fix CompositionApplicativePlus
Merge pull request #364 from xuwei-k/fix-CompositionApplicativePlus

fix CompositionApplicativePlus
Merge pull request #363 from nuttycom/topic/streamt_mapm

Adds mapM to StreamT