Merge pull request awa#114 from jun06t/handle-appstore-http-error

Handle http status 5xx error

Merge pull request awa#106 from mlesar/hotfix/unified-receipt-status

Fixing NotificationUnifiedReceipt status type

Merge pull request awa#101 from mlesar/unified_receipt

Adding unified receipt to the Apple S2S notification

Merge pull request awa#96 from jun06t/appstore-grace-period

Added grace period fields

Merge pull request awa#88 from demiurgestudios/errors

Minor Error Handling Fixes