Added fromNull function for Maybe
Applicative Functor for Validation
Applicative Functor for Validation with accumulated errors
Fixes #18 - 'ap' method implemented for Some and None cases for Maybe/Option monad
Merge branch 'master' of https://github.com/bskyb-myersch/monad.js into feature/validationAppFunctor
Version bump, typo
Merge pull request #21 from bskyb-myersch/master

Applicative Functor with accumulator
Added semigroup appender for Validation
Merge branch 'feature/validationAppFunctor' into develop
Formatting
Merge branch 'release/Release-0.4.0'