update to Scala 2.10.4
Merge pull request #686 from cosmo0920/bump-scala-version

update to Scala 2.10.4
Added type alias ∨ for
Merge pull request #689 from maxpow4h/patch-2

Added type alias ∨ for \/
publish unidoc setting
Scala 2.11.0-RC4
Add toIList and toEphemeralStream to Foldable syntax.

Followup to #681.
Add getOrAdd to Map
Merge pull request #688 from ceedubs/map-getOrAdd

Add getOrAdd to Map
Delete useless `some` and `none` from OptionT
Add some useful `none` and `some` methods to OptionT
Relax `some` and `none` constraint

Should only require Applicative, not Monad.
Merge pull request #692 from puffnfresh/optiont-some-none

OptionT some/none