Fixes #20: add an extra file for CouchDB to put uuid into

CouchDB will put the `uuid` into the 'last file in the configuration
chain' (see: https://issues.apache.org/jira/browse/COUCHDB-2064). Added
a file that will be last lexicographically (with name in upper case), so
the file managed by Chef won't be touched on every restart.
Yes, this is intentional. One of these local changes is UDID that otherwise gets written into `local.ini`. We would like to prevent CouchDB from touching Chef-generated files, so we need to create this last file in the config chain ourselves. Maybe the name is not ideal though, as indeed other setting would be put there as well (everything `PUT` to `/_config`). What would you suggest?