Quick fix for bug that crashes any system running pbd for the first time: os.mkdir doesn't create intermediate directories (like ~/data), so replace with os.makedirs which does.
Merge pull request #4 from mbforbes/fix-mkdir

Quick fix for bug that crashes any system running pbd for the first time...
Merge branch 'groovy-devel' of github.com:PR2/pr2_pbd into groovy-devel