Revert exclusion of intermediate resources

[neomerx]

It used to be that intermediate resources had to be excluded.

Now: Because compound documents require full linkage, intermediate resources in a multi-part path must be returned along with the leaf nodes. For example, a response to a request for comments.author should automatically include comments as well as the author of each of those comments.

However they should be excluded within relationships with 'aliases'. See related #16