def fix_icon(dir)
      if File.exists?(dir+"/icon.png")
        # All ok
      elsif File.exists?(dir+"/icon-lg.png")
        FileUtils.mv(dir+"/icon-lg.png", dir+"/icon.png")
      else
        FileUtils.cp(@opts.template+"/resources/images/default-guide.png", dir+"/icon.png")
      end
    end
def fix_icon(dir)
      if File.exists?(dir+"/icon.png")
        # All ok
      elsif File.exists?(dir+"/icon-lg.png")
        FileUtils.mv(dir+"/icon-lg.png", dir+"/icon.png")
      else
        FileUtils.cp(@opts.template+"/resources/images/default-guide.png", dir+"/icon.png")
      end
    end
Ensures the guide dir contains icon.png.
 When there isn't looks for icon-lg.png and renames it to icon.png.
 When neither exists, copies over default icon.