Include calculated resources in collections in initial response

[joepio]

When a collection is sorted, many of the resources have been fetched by the server. It makes sense to include them in the response to the client (or at least add an option for this). This should speed things up.

Include the resources in the Collection struct (useful for library calls), and find a way to serialize these in the response from servers.

[joepio]

Also fixes #149

[joepio]

It's working now, mostly. But there is a problem. I can't include full Dynamic resources (such as Collections with Members) in reponses. This would lead to a recursive call that never stops, and even I'd circumvent this (by passing a counter or something), the performance would be severely impacted.

I've fixes this by introducing incomplete resources, but this introduces another problem. How should the Server communicate / know which resources are Incomplete?