In order to compile the production assets the app must switch to production, which means that the production database should exist and needs to be specified in the Environmentfile on a per environment basis.  Also removed the Environmentfile.parse and Environmentfile.[] methods, since I now have conditionals in there.  And finally tidied up the database.yml file which had a duplicate environment reference in there.
Client compiled assets weren't working in production unless the asset path is relative.
Merge branch 'master' of github.com:DiUS/TEDxStartSomething