Dynamically create mock instance.

[scheruga]

Please provide the following information:

• JMockit 1.48

Since it is no longer possible to mock a super class directly,
I would like to do it by useing new MockUp whith a generic implementation of
Object $advice(Invocation inv)

I would like to return an instance of a newly created mocked object all the time.
The type of the returned instance would be of ((Method)inv.getInvokedMember()).getReturnType()

Therefore I would need a possibility to create a Mocked instance dynamically.
(Like requested at #46)