Adding maybe_ref, usage in link_resolver, and some explanations
Merge pull request #6 from rudyrigot/maybe_ref

Adding maybe_ref, usage in link_resolver, and some explanations
Documenting and reworking the starter kit towards a real-life usage
Conditionally assigning link_resolver
Merge pull request #7 from rudyrigot/lr_conditional_assignment

Conditionally assigning link_resolver