Fixed Image issues for Web App

Welcome to problems introduced by Windows 101 :-) Windows is not
case-sensitive. You are displaying spades_Ace.jpg and so forth, other
operating systems allow you to have both spades_ace.jpg and
spades_Ace.jpg. Your jpg file names are lowercase, which means you are
looking for a file that doesn't exist on a *nix operating system
(Heroku).

change:

def card_image(card)
"<img src='/images/cards/#{card[0]}_#{card[1]}.jpg'
class='image-polaroid'>"
end
to:

def card_image(card)
"<img src='/images/cards/#{card[0].downcase}_#{card[1].downcase}.jpg'
class='image-polaroid'>"
end
or rename your values when you build the deck to be lowercase.