Auto capture 2.x (#30)
* This version has an implementation of orders api with auto-capture, however the ajax request returns a 503 error
* Added variable in all files. Fixed 503 error, but now pay with razorpay results in a 400 bad request error.
* Fixed minor errors
* Implemented and tested version of orders API with auto-capture for Magento 2.1
* Added a check for hash_equals
* Made some style guide changes
* Made style guide changes to the code based on comments
* Changed getCatalogSession to getRazorpayOrderId
