Implement metadata for transactions.
Merge branch 'master' of https://github.com/pagarme/pagarme-ruby

Conflicts:
	lib/pagarme.rb
	test/pagarme/subscription.rb
	test/test_helper.rb
Merge branch 'master' of https://github.com/pagarme/pagarme-ruby

Conflicts:
	lib/pagarme.rb
	test/pagarme/subscription.rb
	test/pagarme/transaction.rb
	test/test_helper.rb
Merge with pull request