stopped output_filenames from outputting folder names
stopped output_filenames from outputting folder names

The output_filenames method of the Checker class was including folder
paths in its output. This was causing the internal_links and external_links
checkers to choke.

legallybrown/nanoc,nanoc/nanoc,RubenVerborgh/nanoc,hilohiro/nanoc,gjtorikian/nanoc,remko/nanoc,barraq/nanoc