Disabled tests because a running CouchDB server is needed and they
currently don't compile. The latter should be fixed with PR
arjunguha/haskell-couchdb#13.
Merge pull request #1631 from pSub/haskell-couchdb

haskell-CouchDB: Disabled tests because a running CouchDB server is needed
haskell-CouchDB: re-generate with cabal2nix
haskell-adjunctions: add version 4.0.1
haskell-git-annex: update to version 5.20140129
haskell-HList: update to version 0.3.1.0
haskell-ekg: update to version 0.3.1.4
haskell-free: update to version 4.4
haskell-hit: update to version 0.5.4
haskell-http-client-tls: update to version 0.2.0.3
haskell-linear: update to version 1.6
haskell-reflection: update to version 1.4
haskell-unbound: update to version 0.4.3
haskell-wai-extra: update to version 2.0.3.3
sane-backends: Add extra source url

It seems alioth.debian.org has some problem (login needed for download), so
I've added a pkgs.fedoraproject.org url.
obnam: Update to 1.6.1
mkpasswd: Update to 5.1.1
ghc: Fix building on Darwin

http://hydra.nixos.org/build/8598783
llvm-3.4: Only build on Linux

It doesn't build on Darwin because it depends on Valgrind:
http://hydra.nixos.org/build/8616143/nixlog/1/raw
python-3.3: Only build on Linux

It doesn't build on Darwin: http://hydra.nixos.org/build/8597946