Merge pull request #203 from onepercentclub/voucher-redeem-start

Voucher redeem start
Wrap Order creation in a transaction.
Add serializer for Euros -> int + currency.
Making payment now works for authenticated user.
Fix tests.
Some small bug fixes.
Cowry fix for status update.
Disable payment status updates for now.
Remove unused import.
Merge pull request #204 from onepercentclub/order-and-payment-flow-fixes

Order and payment flow fixes
Merge branch 'master' into voucher-redemption
Merge branch 'master' into voucher-redemption

Conflicts:
	apps/fund/models.py
	apps/fund/serializers.py
	apps/fund/views.py