Syntax checking: Add support for pep8 checking of Python and Python3 files.
http://bugs.activestate.com/show_bug.cgi?id=90056
r=marky
rn=

(integrated from komodo (trunk) change 82926 by ericp)

git-svn-id: http://svn.openkomodo.com/repos/openkomodo/trunk@13941 b87d16e7-d29f-4ee1-b5ec-817d645d335f