Update 2014-04-16

Update dependencies from [haskell-core]:

    aeson
    bifunctors
    comonad
    conduit
    conduit-extra
    free
    haskell-src-exts
    monad-logger
    profunctors
    resourcet
    semigroupoids
    semigroups
    unordered-containers
    void
    xml-conduit

Signed-off-by: Nicola Squartini <tensor5@gmail.com>