Reduce nesting in SellerMicroPaymentChannelActor
Extract SellerChannel from SellerMicropaymentChannelActor
Extract a base class for seller channel acto tests
Notify selling progress only on step change
Merge pull request #323 from sortega/realidad_alternativa

Persisten buyer channel actor reloaded
Make logback to append events to a platform-dependent file
Use steps to specify the progress of an Exchange
Introduce FindPaymentResponse trait

To handle all possible responses to FindPayment
Make seller channel actor persistent

Rewrite the actor from the scratch
Merge pull request #324 from apoloval/task/cf-123

Make logback to append events to a platform-dependent file
Remove MessageForwarding by improving BaseChannelActor
Merge pull request #325 from sortega/persistent_seller_channel

Make seller channel actor persistent