add epicodus css
add helpers for displaying flash messages
ensure payment is successful
add css layer
reword sign up message page
change flash notices to alerts
rename sign_up_message to new_subscription_message
have first payment made automatically after account has been confirmed
activate subscription when created
return all subscriptions that are due for payment"
exit
add methods to retrieve subscriptions with payments due
make billable_today method filter out subscriptions without payments
update README