vagrant: add expression
ntopng: new package

ntopng is a high-speed web-based traffic analysis and flow collection
tool. ntopng => ntop next generation.

http://www.ntop.org/products/ntop/
nixos: add ntopng service

ntopng is a high-speed web-based traffic analysis and flow collection
tool. Enable it by adding this to configuration.nix:

  services.ntopng.enable = true;

Open a browser at http://localhost:3000 and login with the default
username/password: admin/admin.
cabal: add support for the enableStaticLibrary flag to enable/disable building of static libraries

Disabling static libraries is supported only in GHC 7.7 or later.
haskell: Propagate cabal dependencies to user env

Before this commit, if a haskell library X depends on Y, and X was added to
systemPackages, only X would be available in the user environment. Y
would not be avialable, which causes X to be broken. This commit solves
the issue by setting propagatedUserEnvPkgs to all packages X depends
on when X is a library.
haskell-errorcall-eq-instance: add version 0.1.0
haskell-case-insensitive: update to version 1.1.0.2
haskell-http-client-*: new packages
haskell-parsers: update to version 0.10.1.2
haskell-text: update to version 1.0.0.0
haskell-pretty-show: update to version 1.6.2
haskell-pretty-show: remove obsolete version 1.2
haskell-github-backup: update to version 1.20131203
haskell-DAV: update to version 0.5
haskell-JuicyPixels: update to version 3.1.2
haskell-authenticate-oauth: update to version 1.4.0.8
haskell-base-compat: update to version 0.3.0
haskell-blaze-html: update to version 0.6.1.2
haskell-blaze-markup: update to version 0.5.1.6
haskell-cmdargs: update to version 0.10.6