[web-devel] More power, more configurable subsites

[Matt Brown]

> That's basically it, but I'm not sure what you mean by "global site
> preparation." The idea here is to do as little as possible before
> dispatching to the subsite, that way if a subsite does not want to
> deal with sessions, it doesn't involve that overhead.
>

I just meant it as a way to enable middleware for all subsites at
once.  It should still be configurable though, so the author can
switch to a per-subsite setup.  For example, it may be appropriate for
the scaffolder to enable sessions globally, and let the author switch
to per-subsite if/when performance becomes a concern.

-matt