[Portland] xdg-utils proof of concept

[Jeremy White]

> My point is that the description "opens browser" is misleading as it will open 
> the default handler for the given URL, which is not necessarily a browser as 
> illustrated with the README (plain text file).

And, on a side note, my apologies for renaming it from xdg-open
to xdg-open-url.  I wanted to start more basic; the thinking was that
'third tier' WMs (even twm) could probably support some form of open-url,
but that the more sophisticated 'open' behaviors (e.g. with README)
weren't guaranteed.

Cheers,

Jeremy