[MERGE] Add a 'nosmart+' transport decorator.

[Andrew Bennetts]

Martin Pool wrote:
> On undefined, Andrew Bennetts <andrew at canonical.com> wrote:

You might want to get your clock looked at ;)

[...]
> I think of both + and - as having different meanings in urls as they
> are commonly used: plus indicating stacking, as we use it, and dash
> joining words within a name.  Our current use is pretty consistent
> with the precedents.
> 
> +1 to nosmart

Ok, between you and Ian, that's good enough for me.  I'll merge it as-is.

Thanks everyone for the ideas.

-Andrew.