Merge pull request #44 from sharoonthomas/develop

Refactor and move methods to sale_payment_gateway
Saving sale date as current date of sale on payment #5567
Merge pull request #45 from goyal1092/feature/task-5567

Saving sale date as current date of sale on payment #5567
Release version 3.2.0.2
Merge branch 'release/3.2.0.2' into develop
Add requirements.txt to have sale shop installed