Allow multiple configuration files

From WW-82:

Allow Multiple Configuration Files for better large team concurrent development. It would be very beneficial for large team concurrent development to allow for the use of multiple configuration files (perhaps all files in a directory?) to allow for the configuration parameters of an app to be split up according to functional area. In concurrent development with version control (or even worse, without) managing many users making concurrent changes to a single configuration file can be a significant bottleneck as changes must be integrated before new changes can be submitted.