Wrong resolution of Multi-dimensional generic arrays

[cowtowncoder]

(see #103 for background)

List<String>[][] loses its type parameter:

// Element type is GenericArrayType, not ParameterizedType, so falls through
if (elementType instanceof ParameterizedType) { ... }
return arrayType.getErasedType(); // Returns List[][] — String is lost

Possible fix:

if (elementType instanceof ParameterizedType || elementType instanceof GenericArrayType)

[cowtowncoder]

Not sure this actually fails....

[cowtowncoder]

False alarm: #103 was discussing problem with PR itself, NOT core resolution as it exists.
Will add a unit test tho.