JS Stubs depend on javaType.

[mcarcaso]

This line here makes stripping the javaType property from foam.core.Arguments impossible:
https://github.com/foam-framework/foam2/blob/master/src/lib/Stub.js#L21

[adamvy]

I don't think we every want to serialize contexts, so if we have a foam.typeOf() for Context then we should just be able to always null them out as arguments.

I also think we should add contextOriented: true to Method so we can better detect this (it would also clean up some hacks in the java Skeleton code).