Bug 883827.  Make Optional<NonNull<T>> and Optional<OwningNonNull<T>> nicer to use by having their const Value() method return a T&.  r=peterv
Bug 884401.  Remove the hasXPConnectImpls annotations for HTMLElement, Element, and Node in WebIDL bindings, since all those are gone.  r=peterv
Bug 883887.  Add an Unlink method to js::ExpandoAndGeneration.  r=peterv