pythonPackages.pytestflakes: Move to own file

pkgs/development/python-modules/pytest-flakes/default.nix

@@ -0,0 +1,25 @@
+{ stdenv, buildPythonPackage, fetchPypi
+, pytestpep8, pytest, pyflakes, pytestcache }:
+
+buildPythonPackage rec {
+  pname = "pytest-flakes";
+  version = "1.0.1";
+
+  src = fetchPypi {
+    inherit pname version;
+    sha256 = "0flag3n33kbhyjrhzmq990rvg4yb8hhhl0i48q9hw0ll89jp28lw";
+  };
+
+  buildInputs = [ pytestpep8 pytest ];
+  propagatedBuildInputs = [ pyflakes pytestcache ];
+
+  checkPhase = ''
+    py.test test_flakes.py
+  '';
+
+  meta = with stdenv.lib; {
+    license = licenses.mit;
+    homepage = https://pypi.python.org/pypi/pytest-flakes;
+    description = "pytest plugin to check source code with pyflakes";
+  };
+}