ByteBudyImposterizer fails to mock scala case classes

[laurynaslubys]

It seems, that the ByteBuddy imposterizer is too strict when mocking classes. We have the following situation:

1. a scala case class has a field annotated with @JsonIgnore
2. the scala compiler adds this annotation to the parameter corresponding with the field in the scala generated copy method
3. ByteBuddy type validation fails, because @JsonIngore is not marked as being valid for parameters

I believe that JMock should not validate the generated class as the validation is too strict and if the source class is not strictly valid according to ByteBuddy, it's impossible to mock such a class at all.

What are your thoughts?

I'll submit a PR shortly

[olibye]

fixed by #181