wip
move all applepay code behind a compiler flag
Update StripeExample-Info.plist
fix example storyboard
Merge branch 'applepay-in-category' of github.com:stripe/stripe-ios into applepay-in-category
Merge pull request #67 from stripe/applepay-in-category

This moves all Apple Pay code behind a compiler flag to avoid people accidentally including it in their project.