There are two changes in this MR that work together:
* Remove logic to abort routing if a path segment contains a path separator, e.g. '%2F'.
* URL path parameters and decoded before being passed to route handlers.
* To still permit matching URL routes that are not URL encoded, e.g. '/foo bar', encode
  these paths before adding them to route matching.

See: vibe-d#34

…path matching.

…th characters.

…the router.