in_dir can now take a single string as argument (for ruby 1.9.1 compatibility)
in_dir can now take a single string as argument (for ruby 1.9.1 compatibility)

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