Bump 'tested up to' to 4.1
#534 Fixed size of gift-card-background.png
Merge branch 'feature/534_gift_cards_for_time_passes' of github.com:laterpay/laterpay-wordpress-plugin into feature/534_gift_cards_for_time_passes
#534 Styling for gift card
Merge branch 'feature/534_gift_cards_for_time_passes' of github.com:laterpay/laterpay-wordpress-plugin into feature/534_gift_cards_for_time_passes