nltk: Initial packaging

nltk.nix

@@ -0,0 +1,20 @@
+with import <nixpkgs> {};
+
+buildPythonPackage rec {
+  name = "nltk-${version}";
+  version = "3.2.1";
+
+  src = fetchurl {
+    url = "mirror://pypi/n/nltk/${name}.tar.gz";
+    sha256 = "0skxbhnymwlspjkzga0f7x1hg3y50fwpfghs8g8k7fh6f4nknlym";
+  };
+
+  propagatedBuildInputs = [ pythonPackages.sqlite3 ];
+
+  meta = with stdenv.lib; {
+    homepage = http://www.nltk.org/;
+    description = "Natural Language Toolkit is a platform for building Python programs to work with human language data";
+    platforms = platforms.all;
+    license = licenses.asl20;
+  };
+}