init alipay
Add more test
Update readme.
Update readme for highlight
Add direct pay url generate method.
Verify sign when verify notify.
Update Readme and notify test
Fix notify verify url
Update README for gem install.
Fix README typo
replace symbolize_keys with stringify_keys
Merge branch 'stringify_keys'
update version to 0.0.2
add Alipay.create_refund_url interface.
add generate_batch_no utils.
add missing querystring mark.
stringify data key.
add some tip.
update readme.
Merge pull request #2 from saberma/master

支持支付宝有密批量退款接口