prevent appversions duplicates (bug 1007544)
Merge pull request #202 from magopian/1007544-prevent-appversions-duplicates-reloaded

prevent appversions duplicates (bug 1007544)
Use defautl STATIC_ROOT in dev too (bug 1013865)
Merge pull request #207 from yohanboniface/bug-1013865-staticfiles-fixes

Use defautl STATIC_ROOT in dev too (bug 1013865)