Added Data.Foldable and instances.
Added some Foldable functions.
Added Data.Traversable and instances.
Removed duplicated functions.
Merge branch 'master' of github.com:purescript/purescript
Array is acting funny.
Merge branch 'master' of github.com:purescript/purescript
Array is unfunny now. Add some foldable functions. Removed duplicates.
Merge pull request #274 from joneshf/master

Added Data.Foldable and Data.Traversable to Prelude.