ext/ffs_engine — pull request #47 by ext (2013-12-14 06:11:01+00:00)
Title: Misc 20131214

Makes `Data` handle `%APP%` in the path which can be set by the application, e.g. logging can search config in `%APP%/config.yaml` (which user can set to the appropriate directory).

Also fixes a bug in config when merging with an empty config.