pep8 fixes

git-svn-id: svn://fountainhead.talkpoint.com/nori/trunk@13195 940247f8-a3eb-dc11-81c7-0019d144f6e4
add mkdir_p()

git-svn-id: svn://fountainhead.talkpoint.com/nori/trunk@13201 940247f8-a3eb-dc11-81c7-0019d144f6e4