merge builder and rss into one guide
Add an omniauth recipe.
Add a better_errors recipe
Merge pull request #48 from patriciomacadden/better_errors

Add a better_errors recipe
change the title and the introduction; show how to start the app with environment variables; remove the complete example; add links at the bottom; etc.
improved the omniauth-twitter recipe
Merge pull request #47 from patriciomacadden/omniauth

Add an omniauth recipe.
CSS changes