killbill-memoizeit

Merge branch 'payments-combo' Conflicts: jaxrs/src/main/java/org/killbill/billing/jaxrs/resources/PaymentResource.java

Remove constraint on account externalKey when doing combo …

payment call and fix NPE when not specifying plugin properties

Add tests for capture and void using payment externalKey

Code review for payment opertion using externalKey

Add plugin properties per operations in payment combo call

Add ability to refund/void.chargeback based on payment externalKey

Add api to retrieve payment by externalKey

Remove unused paymentId in captureAuthorizationByExternalKey

Add ability to capture using externalKey

payment: fix confusing logging message in IncompletePaymentTransactionTask This …

fixes https://github.com/killbill/killbill/issues/356.

Because we want to retry, we have to throw an exception (we cannot
get rid of the stacktrace in the logs).

Signed-off-by: Pierre-Alexandre Meyer <pierre@mouraf.org>