fix logic for "low credits" email send
I've been on the service for 30 minutes, and I've already gotten 4 "Your card lasso credits are running low" emails. I submitted some cards (probably tripping an email), some had validation fail (which maybe tripped another one?), and then re-captured (tripping yet another), and not sure where the 4th came from (maybe validation fail while I was still captureing?). Perhaps I should get 1 message about "getting low", and then NEVER get another until I re-up (or it's a new month). Irritating.
Anyway, email overload! Also, consider that if I sign up for 20 credits a month, is me going under 10 really "getting low"? Probably not. Especially when my first pro-rated month only had 16 credits to start with. That's like my "low gas" light going on in my car when I've only used 1/3 of the tank. ;)
