Fixed URL resolving in the case where an outer regex includes an inner
regex and both regexes use positional parameters instead of named
groups, causing the outer regex's parameters to override the inner
regex's.
Modified the regex url resolver so that it will concatenates and then
normalizes, instead of normalizing and then concatenating.
Tim Graham
Athena
Loic Bistuer
Claude Paroz
Aymeric Augustin
Florian Apolloner