Http respons status

[andrii-kovalenko-ct]

@butenkor @ahalberkamp

it's a fix for the issue #15 (Discuss and specify create order API)

unfortunately, there are some other "side" fixes, which i was not able simply avoid from this commit, but the main implementation notes according to the issue #15 are:

• in MessageFilter we skip and log messages, if we expect then can't be processed (already ordered, invalid payment, transaction etc)

• in OrderCreator:

  • if response status is 201 - proceed without logging
  • mark the message as processed for all 2xx return
  • re-try messages next run if a response was not 2xx

[andrii-kovalenko-ct]

resolves https://github.com/commercetools/commercetools-payment-to-order-processor/issues/15

[andrii-kovalenko-ct]

released https://github.com/commercetools/commercetools-payment-to-order-processor/releases/tag/v0.4