updated taffybar
haskell fix - fay

Remove explicit old aeson version and update to latest
haskell-xlsx: re-generate with cabal2nix
Bump ghc-head to latest.
Added monadSupply (monad-supply) to haskellPackages
haskell-happy-meta: update to version 0.2.0.7
haskell-DAV: update to version 1.0.1
haskell-amqp: update to version 0.10.1
haskell-authenticate: update to version 1.3.2.10
haskell-aws: update to version 0.10.2
haskell-clientsession: update to version 0.9.0.5
haskell-conduit-extra: update to version 1.1.3.2
haskell-contravariant: update to version 1.2
haskell-ekg: update to version 0.4.0.2
haskell-github: update to version 0.10.0
haskell-gtk-traymanager: update to version 0.1.5
haskell-hcltest: update to version 0.3.4
haskell-pandoc-citeproc: update to version 0.4.0.1
haskell-pcre-light: update to version 0.4.0.3
haskell-cabal-bounds: update to version 0.8.4