Add execution context for updating ScalaFX nodes
Add CredentialsTester trait
Implement OKPayCredentialsStepPane
PR feedback
Merge pull request #172 from sortega/task/40_wizard_steps

Implement OKPayCredentialsStepPane
Generate QR code images
Implement TopUpStepPane
Make the wizard a non-resizable dialog
Move dependencies out of the constructor in the exchange classes
Merge pull request #174 from sortega/task/40_wizard_steps

Implement TopUpStepPane
Merge pull request #173 from edrevo/remove-constructor-deps

Move dependencies out of the constructor in the exchange classes
Add step number to StepSignature message
Add new function to Exchange trait
Add basic failure handling to BuyerExchangeActor
Merge pull request #175 from edrevo/implement-error-handling-in-exchange

Implement error handling in BuyerExchangeActor
Adapt PasswordStepPane to the style of other steps
Move BitcoinjTest to common
Merge pull request #176 from sortega/task/40_wizard_steps

Adapt PasswordStepPane to the style of other steps
Merge pull request #177 from sortega/task/41_abstract

Move BitcoinjTest to common
Add domain model for the exchange protocol