ledger: 3.0.2 -> 3.0.4
Allow ansible to install on darwin platforms

I am using this package on my Yosemite install of OS X and it works great. It also pretty closely follows the Homebrew recipe that most OS X users use, so I think we can open it up to other OS X users.
Update to latest ansible version
boost: Quick eval fix
Use Nix default version of boost library.
Remove references to <nixpkgs>

Nixpkgs should not use <nixpkgs> to refer to itself, because $NIX_PATH
might not be set or not point to the same Nixpkgs. It's also
unnecessary.
Disable tests for snapper-gui
boost155: specify lib dir for lib output
Revert "boost155: specify lib dir for lib output"

This reverts commit e640935da6052547faaa8fe7d63bd8774de9f45c.
ocamlPackages: pin at 4.01, since much breaks with 4.02
Merge pull request #4231 from rickynils/install-grub

nixos/install-grub: Don't run GrubFs(/nix/store) if copyKernels is true
haskell-haskoin: disable test suite to fix the build

https://github.com/haskoin/haskoin/issues/109
haskell-libmpd: don't build obsolete version 0.8.0.5 unless some other package depends on it
haskell-basic-prelude: update to version 0.3.9
haskell-cassava: update to version 0.4.2.0
haskell-compdata-param: update to version 0.8.0.2
haskell-conduit-extra: update to version 1.1.4
haskell-esqueleto: update to version 2.0.2
haskell-formatting: update to version 5.4
haskell-ghcjs-dom: update to version 0.1.1.0