Empact/roo — pull request #90 by jayjlawrence (2013-12-14 19:03:54+00:00)
Title: Certain excelx files result in nil 'rels_files', do not follow rel in this case

I have included a example XLSX file that exercises this case along with a proposed fix. I did not follow back to see how @rels_files was generated, perhaps the fix is better there?