include_glob: include with glob support

[Jonathan Dance]

> Thank you. I will extend the "include" directive to
> include  vhosts/*.conf

Okay, great. I wasn't sure how you wanted to handle it, but having it
as part of the include is ideal. I updated my code to do the glob as
part of the include directive. I also moved the ngx_conf_full_name
call outside the glob, which I think makes much more sense.

This is my new diff:
http://pastie.caboo.se/15137