add package into extension

README.md

packages/stripe-php/.gitignore

packages/stripe-php/.travis.yml

packages/stripe-php/CHANGELOG

packages/stripe-php/LICENSE

packages/stripe-php/README.rdoc

packages/stripe-php/VERSION

packages/stripe-php/composer.json

packages/stripe-php/lib/Stripe.php

packages/stripe-php/lib/Stripe/Account.php

packages/stripe-php/lib/Stripe/ApiConnectionError.php

packages/stripe-php/lib/Stripe/ApiError.php

packages/stripe-php/lib/Stripe/ApiRequestor.php

packages/stripe-php/lib/Stripe/ApiResource.php

packages/stripe-php/lib/Stripe/ApplicationFee.php

packages/stripe-php/lib/Stripe/ApplicationFeeRefund.php

packages/stripe-php/lib/Stripe/AttachedObject.php

packages/stripe-php/lib/Stripe/AuthenticationError.php

packages/stripe-php/lib/Stripe/Balance.php

packages/stripe-php/lib/Stripe/BalanceTransaction.php