python.pkgs.sockjs-tornado: move to a separate file

pkgs/development/python-modules/sockjs-tornado/default.nix

@@ -0,0 +1,20 @@
+{ lib, buildPythonPackage, fetchurl, tornado }:
+
+buildPythonPackage rec {
+  name = "sockjs-tornado-${version}";
+  version = "1.0.3";
+
+  src = fetchurl {
+    url = "mirror://pypi/s/sockjs-tornado/${name}.tar.gz";
+    sha256 = "16cff40nniqsyvda1pb2j3b4zwmrw7y2g1vqq78lp20xpmhnwwkd";
+  };
+
+  propagatedBuildInputs = [ tornado ];
+
+  meta = with lib; {
+    homepage = http://github.com/mrjoes/sockjs-tornado/;
+    description = "SockJS python server implementation on top of Tornado framework";
+    license = licenses.mit;
+    maintainers = with maintainers; [ abbradar ];
+  };
+}