Eelco Dolstra 484403bf0e Add a constant ‘nixpkgsVersion’
This makes it a bit easier to find out the current Nixpkgs version,
e.g.

  $ nix-instantiate --eval '<nixpkgs>' -A lib.nixpkgsVersion
  "14.02.35657.66f51a9"
2014-02-19 19:03:16 +01:00
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