Merge pull request stripe-ruby-mock#289 from TrevorHinesley/master

Added missing Invoice fields

Author: alexmamonchik

lib/stripe_mock/data.rb

@@ -224,9 +224,17 @@ def self.mock_invoice(lines, params={})
  customer: "test_customer",
  object: 'invoice',
  attempted: false,
+ application_fee: nil,
  closed: false,
+ description: nil,
  forgiven: false,
+ metadata: {},
  paid: false,
+ receipt_number: nil,
+ statement_descriptor: nil,
+ tax: nil,
+ tax_percent: nil,
+ webhooks_delivered_at: 1349825350,
  livemode: false,
  attempt_count: 0,
  amount_due: lines.map {|line| line[:amount]}.reduce(0, :+),