Branching to test-visitor-removal-3231-2

git-svn-id: svn://svn.twistedmatrix.com/svn/Twisted/branches/test-visitor-removal-3231-2@36848 bbbe8e31-12d6-0310-92fd-ac37d47ddeeb
Merge forward.

git-svn-id: svn://svn.twistedmatrix.com/svn/Twisted/branches/test-visitor-removal-3231-2@36849 bbbe8e31-12d6-0310-92fd-ac37d47ddeeb
Fix comment in scripttest.py

git-svn-id: svn://svn.twistedmatrix.com/svn/Twisted/branches/test-visitor-removal-3231-2@37271 bbbe8e31-12d6-0310-92fd-ac37d47ddeeb
Fix topfile to reflect old DocTestCase removal.

git-svn-id: svn://svn.twistedmatrix.com/svn/Twisted/branches/test-visitor-removal-3231-2@37272 bbbe8e31-12d6-0310-92fd-ac37d47ddeeb
Fix pyflakes.

git-svn-id: svn://svn.twistedmatrix.com/svn/Twisted/branches/test-visitor-removal-3231-2@37273 bbbe8e31-12d6-0310-92fd-ac37d47ddeeb
Merge remote-tracking branch 'origin/trunk' into test-visitor-removal-3231-2