Fix installation of pandoc's man pages.

They stopped being installed automatically due to upstream simplification of
Setup.hs.

Signed-off-by: Magnus Therning <magnus.therning@evidente.se>
Updates 2014-09-03

    JuicyPixels
    MonadRandom
    auto-update
    c2hs
    conduit
    conduit-combinators
    conduit-extra
    crypto-random
    either
    entropy
    ghc-mod
    ghc-syb-utils
    haddock-library
    highlighting-kate
    hlint
    hspec
    http-client
    http-conduit
    language-c
    mmorph
    monad-journal
    monad-logger
    pandoc
    pandoc-citeproc
    persistent
    persistent-sqlite
    persistent-template
    simple-sendfile
    stylish-haskell
    tls
    x509
    xml-conduit
    yaml

Signed-off-by: Magnus Therning <magnus@therning.org>
Add hexpat to fix issue in pandoc-citeproc.

Signed-off-by: Magnus Therning <magnus@therning.org>
Add xmobar with all_extensions