get rid of unused type parameter on Foldable#sequence_
fix Function1Comonad#cojoin
Make glorified Foldable `identity`s into actual `identity`s.
Merge pull request #385 from xuwei-k/Function1Comonad-cojoin

fix Function1Comonad#cojoin
Merge pull request #386 from S11001001/topic/foldable-identities

Make glorified Foldable `identity`s into actual `identity`s.
Stream is Cojoin and Cobind
LazyOption is Cojoin and Cobind
move cobindAssociative from Comonad
add cojoin test
add Function1Cojoin
Merge pull request #388 from xuwei-k/function1cojoin

add Function1Cojoin
Merge pull request #387 from xuwei-k/req/cojoin-cobind

Cojoin and Cobind instances