pythonPackages.blinker: Move to own file

pkgs/development/python-modules/blinker/default.nix

@@ -0,0 +1,18 @@
+{ stdenv, buildPythonPackage, fetchPypi }:
+
+buildPythonPackage rec {
+  pname = "blinker";
+  version = "1.4";
+
+  src = fetchPypi {
+    inherit pname version;
+    sha256 = "1dpq0vb01p36jjwbhhd08ylvrnyvcc82yxx3mwjx6awrycjyw6j7";
+  };
+
+  meta = with stdenv.lib; {
+    homepage = http://pythonhosted.org/blinker/;
+    description = "Fast, simple object-to-object and broadcast signaling";
+    license = licenses.mit;
+    maintainers = with maintainers; [ garbas ];
+  };
+}