Whitelist six.py for flake8.

We shouldn't waste time formatting code that is really an external dependency, that we are just bundling for convenience.

Whitelist six.py for flake8.
c3b0cf48 · David Warde-Farley · Arnaud Bergeron · 6d7e0403 · c3b0cf48
--- a/theano/tests/test_flake8.py
+++ b/theano/tests/test_flake8.py
@@ -19,6 +19,7 @@ __copyright__ = "(c) 2015, Universite de Montreal"
 __contact__ = "Saizheng Zhang <saizhenglisa..at..gmail.com>"

 whitelist_flake8 = [
+    "compat/six.py",  # external package bundled for convenience.
    "__init__.py",
    "tests/test_gradient.py",
    "tests/test_config.py",