resolves the issue with:

java: brooklyn.entity.rebind.Rebindable cannot be inherited with different arguments: <brooklyn.mementos.EntityMemento> and <>

This is done by dropping generics for the Rebindable, but relying on coveriant return types for getMementoSupport. Provides the same typesafety, at the price of a bit more code.
Merge pull request #668 from pveentjer/rebindablecompileissue

resolves the issue with: