Add new package netrw, version 1.3.2.

The upstream URL unfortunately wasn't available at this time, so I provided an
alternate mirror. I checksummed the file against the hashes from various
distributions in order to make sure it's the right one.

pkgs/tools/networking/netrw/default.nix

@@ -0,0 +1,19 @@
+{ stdenv, fetchurl }:
+
+stdenv.mkDerivation rec {
+  name = "netrw-${version}";
+  version = "1.3.2";
+
+  src = fetchurl {
+    urls = [
+      "http://mamuti.net/files/netrw/netrw-${version}.tar.bz2"
+      "http://www.sourcefiles.org/Networking/FTP/Other/netrw-${version}.tar.bz2"
+    ];
+    sha256 = "1gnl80i5zkyj2lpnb4g0q0r5npba1x6cnafl2jb3i3pzlfz1bndr";
+  };
+
+  meta = {
+    description = "A simple tool for transporting data over the network.";
+    homepage = "http://mamuti.net/netrw/index.en.html";
+  };
+}

pkgs/top-level/all-packages.nix

@@ -1120,6 +1120,8 @@ let
 
   netpbm = callPackage ../tools/graphics/netpbm { };
 
+  netrw = callPackage ../tools/networking/netrw { };
+
   netselect = callPackage ../tools/networking/netselect { };
 
   networkmanager = callPackage ../tools/networking/network-manager { };