Update the document number to the latest version, and remove the /get/
prefix since it now supports both the GET and POST portions of the spec.
Also update one piece of tooling to properly get the ARI URL from the
directory, rather than hard-coding it.
Give ARI improved error messages when no request path is specified and
when parsing of the request path blob fails.
Also, add a tool which can be used to quickly generate ARI requests and
print their results, to make manual spot-checking easier.
Fixes#6629