Accessing Root object when creating links in embbedded items #12

To define links in embbedded items frequently is neccessary to have access to parent node info.

For example if we have a "folder" resource with a "self" link [folder], usually each of its items will have a "self" link as [folder]/[item]. To generate each item "self" link it needs all info in its parent object.

What I propose is to use the same

.Links((model, context) =>

,but extending context to not only contain NancyContext, but to be "custom" a HalContext with

public class HalContext
{
    public NancyContext NancyContext { get; set; }
    public Object Root { get; set; }
}

To mantain compatibiltiy with existing code we could have something like

public HalTypeConfiguration<T> Links(Func<T, NancyContext, Link> linkGetter)
{
    Func<T, HalContext, Link> halLinkGetter = (t, context) => linkGetter(t,context.Nancy);
    AddLinkFn(halLinkGetter);
    return this;
}

What do you think?
...and of course, i'm not asking you to do this.. i could implement this (or the solution proposed) myself.