assignability to parameterized required type

2 days before the CDI-1.1 spec went PDF the following backward-incomatible change was made:

-A raw bean type is considered assignable to a parameterized required type if the raw types are identical.

+ A raw bean type is considered assignable to a parameterized required type if the raw types are identical and all type parameters of the bean type are either unbounded type variables or java.lang.Object.

This breaks a lot of projects and also is also not compatible with the JavaEE6 RI and the CDI-1.0 RI where this was explicitly allowed.

This is a follow up to CDI-304.