Completed flake8 cleanup.

I've decided to go with longer lines in the tests. Also fixed a couple
errors with the previous cleanup.

Author: waylan

markdown/__init__.py

@@ -32,7 +32,7 @@
 
 from __future__ import absolute_import
 from __future__ import unicode_literals
-from .__version__ import version, version_info # flake8: noqa
+from .__version__ import version, version_info  # noqa
 import codecs
 import sys
 import logging

markdown/extensions/admonition.py

@@ -4,7 +4,7 @@
 
 Adds rST-style admonitions. Inspired by [rST][] feature with the same name.
 
-[rST]: http://docutils.sourceforge.net/docs/ref/rst/directives.html#specific-admonitions  # flake8: noqa
+[rST]: http://docutils.sourceforge.net/docs/ref/rst/directives.html#specific-admonitions  # noqa
 
 See <https://pythonhosted.org/Markdown/extensions/admonition.html>
 for documentation.