• fixed: Fix using incorrect path prefix when nesting Routers at / (#691)
• fixed: Make nest("", service) work and mean the same as nest("/", service) (#691)
• fixed: Replace response code 301 with 308 for trailing slash redirects. Also deprecates
  Redirect::found (302) in favor of Redirect::temporary (307) or Redirect::to (303).
  This is to prevent clients from changing non-GET requests to GET requests (#682)