Stripe Fixes: Proration, Single Subscription, Account Deletion

What Was Wrong: If you upgraded from Pro to Scale, you ended up with two active subscriptions and paying the full amount twice. Also, if you deleted your OpinionX account, it didn't automatically delete your Stripe subscription.

What We Did: Stripe (our payments processor) is now setup to automatically prorate the amount you pay and transition your single active subscription if you upgrade your pricing plan mid-period. If you delete your OpinionX account, Stripe will now automatically cancel your subscription.