wget darwin: disable Test-iri-disabled.px

This test fails on MacOS X. The failure has something to do with
the tests expecting filesystems to accept/store filenames as
bytes. On the HFS+ filesystem, however, filenames are Unicode
characters (Normalisation Form D).

This wget ticket appears to be relevant
    http://savannah.gnu.org/bugs/index.php?27541

The maintainer does not seem to think that this test
failure represents a problem in practice:
    http://article.gmane.org/gmane.comp.web.wget.general/8988

But this patch should be revisited/removed if this aspect of wget is
ever addressed in the future.

NB: I'm also a bit concerned/confused that none of the tests mentioned
in that message seem to fail, so I'm not 100% sure if this is the
relevant issue.
sdlmame: update to latest version
mpd: update to latest version
awesome: add which to build inputs (for awesome-client)
Fixes go 1.1.2 compilation on OSX Maverick

Apparently Apple thinks that faking gcc wiht a clang stub but not providing a
compatile libgcc.a is not going to cause any issues. They really do hate GPL.
yandex-disk: add the Yandex.Disk cloud storage client

Details:
http://help.yandex.com/disk/cli-clients.xml
nginx: adding rtmp module
nginx: rtmp module - commited to fast. now it works.
Allow building/testing individual systemd units
Fix broken Conflicts options
Apply better type checking to unitConfig/serviceConfig/...

In particular, complain if two modules define the same systemd option.
Use types.lines for script/preStart/postStart/postStop
Allow overrides to work for unit options
Check whether fileSystems defines the root FS
Allow running NixOS services outside of systemd

The attribute ‘config.systemd.services.<service-name>.runner’
generates a script that runs the service outside of systemd.  This is
useful for testing, and also allows NixOS services to be used outside
of NixOS.  For instance, given a configuration file foo.nix:

  { config, pkgs, ... }:

  { services.postgresql.enable = true;
    services.postgresql.package = pkgs.postgresql92;
    services.postgresql.dataDir = "/tmp/postgres";
  }

you can build and run PostgreSQL as follows:

  $ nix-build -A config.systemd.services.postgresql.runner -I nixos-config=./foo.nix
  $ ./result

This will run the service's ExecStartPre, ExecStart, ExecStartPost and
ExecStopPost commands in an appropriate environment.  It doesn't work
well yet for "forking" services, since it can't track the main
process.  It also doesn't work for services that assume they're always
executed by root.
httpd.nix: Support non-root operation
firefox: Update to 25.0.1
polkit: The rule file needs to end in .rules

Otherwise it's ignored.
polkit: Fix authenticating as a wheel user

In Javascript-based PolKit, "unix-user:0;unix-group:wheel" is not
valid; it should be a list "unix-user:0", "unix-group:wheel".
polkit: Add some examples