fixed #803: Build system does not create app/log folder in new projects
merged 48869b57bbdf1da1ed4eeeaf36287f155fb05543 to 6b72ca12e49046abd4286bbeca8918d2db828e42 (from 0.11) (really just ported 7c3ae8d31095a3340ec5718a4b1bdc61334bf0b0, refs #803)