Also handle Errno::EACCES when trying to delete the directory.

Closes #216

lib/paperclip/storage/filesystem.rb

@@ -63,7 +63,7 @@ module Paperclip
               FileUtils.rmdir(path)
               break if File.exists?(path) # Ruby 1.9.2 does not raise if the removal failed.
             end
-          rescue Errno::EEXIST, Errno::ENOTEMPTY, Errno::ENOENT, Errno::EINVAL, Errno::ENOTDIR
+          rescue Errno::EEXIST, Errno::ENOTEMPTY, Errno::ENOENT, Errno::EINVAL, Errno::ENOTDIR, Errno::EACCES
             # Stop trying to remove parent directories
           rescue SystemCallError => e
             log("There was an unexpected error while deleting directories: #{e.class}")