Feature Request: Environment variable expansion in CMAB

I've been using CMAB for sometime now and the only big crib that I have
against it is that it doesnt support environment variables for
specifying things like the path of the actual configuration file [One
of the projects that does is Log4Net]


I've looked at the code and supporting environment variable expansion shoudlnt be too difficult to do.


I'll post a suggestion in and see what happens.