Guise Mummy needs a way to configure site-wide options, e.g. whether pages have filename extensions ().
Guise Mummy needs to recognize the file .guise-mummy-site.* in the site root as a configuration file, supporting a common set of extensions using Confound. In particular we need to support:
UTF-8 properties files: .guise-mummy-site.properties
TURF files: .guise-mummy-site.turf
The configuration information should be made available as a Configuration instance in the mummy context, accessed as getSiteConfiguration().