Added customizable store options from michelson.
Border color fix and cleanup.
"Weekly" to "Week" fix by tigris.
Map NEXTBILLINGDATE to next_payment_date method by devton.
Change :rubygems to 'https://rubygems.org' by paulociecomp.
More IPN notifications by dsaenztagarro.
Remove duplicate entry by marciotoze.
Readme fixes.