* remove parallel saves from the code
* fix more unit tests
* do not save users when sending message in buyGift (saved later)
* fix test
* reinstall
* fix tests
* fix tests
* Rarranged payment index functions
* Moved gem function
* Increased buy gems test coverage
* Reduced length of functions. Reduced cognitive complexity
* Added more tests for verifyGemPurchase
* Added more tests for subscribe
* Added user is subscribed check
* Reverted gulp task
* Added existence check