Fix defaut IFS for Ubuntu 11.x

lib/design.sh

@@ -33,7 +33,7 @@ design() {
   local project=`basename $(pwd)`
   local all_project_dirs="$design_base_dirs $design_av_dirs"
   # Ensure design dir contains all subdirectories
-  unset IFS
+  IFS=$' \t\n'
   # Create root design dirs
   for dir in $design_ext_dirs; do mkdir -p "$root_design_dir/$dir"; done
   # Create project design dirs