wildcard entry

I have an invoker.ini file like this:

```ini
[foo]
dir = foo

[api.foo]
dir = api

[bar.foo]
dir = bar
```

My problem is that foo.dev is my "main" site, but I need *.foo.dev to go to api (other than bar).
My current thinking is to allow a directive `wildcard = true` or `alias = *.foo`