anchor.diff:        changefreq daily
         priority= 0.9
   
  -  //- Nonprofit
     each nonprofit in nonprofits
       url
         loc #{appUrl}/nonprofits/#{nonprofit.replace(/\s/g, '-')}
  
positive.code:     loc http://www.freecodecamp.com/
      changefreq weekly
      lastmod= now
      priority= 0.5
  
    url
      loc http://www.freecodecamp.com/nonprofits
      changefreq weekly
      lastmod= now
      priority= 0.5
  
    url
      loc http://www.freecodecamp.com/learn-to-code
      changefreq weekly
      lastmod= now
      priority= 0.5
  
    url
      loc http://www.freecodecamp.com/twitch
      changefreq weekly
      lastmod= now
      priority= 0.5
  
    //- Home page
    url
      loc= appUrl
      lastmod= now
      changefreq daily
      priority= 0.8
  
    //- User
    each user in users
  
negative.code:       changefreq weekly
        priority= 0.5
  
    each challenge in challenges
      url
        loc #{appUrl}/challenges/#{challenge.replace(/\s/g, '-')}
  