mod15, hw1 finished. Modify Stripe charge to monthly subscription.
mod15 hw2(1) finished, add StripeEvent Gem, address webhook by tunnel service[ngtok], requestBin, create Payment model.
mod15 hw2(2) finished, create Payment view/controller, feature test, add AdminsController.
mod15 finisehd, lvl3 program finished, add Stripe event for charge.failed
Merge pull request #19 from jamesyang124/mod15

Mod15