url: special case bundle URL parsing to preserve backwards compatibility
This allows bundle://../foo to continue to refer to the relative path
../foo (bundle URLs do not take host names).
Ancestors of 5
4 2 0
Ancestors of 6 and 5
3 4 2 1 0
Ancestors of 5 and 4
4 2 0
Descendants of 5
7 8
Descendants of 5 and 3
6 7 8
Descendants of 5 and 4
5 7 8