Make sure that we don't destroy the current CONFIG
Make sure that we don't destroy the current CONFIG

Found this by looking at other example rebar.config.script examples. We
want to be sure we aren't accidentally removing configuration values
from the global CONIFG value.

fkaempfer/couchdb,ngpestelos/couchdb-couch,alanning/couchdb-couch,fkaempfer/couchdb,alanning/couchdb-couch,KlausTrainer/couchdb-couch,smithsz/couchdb-couch,apache/couchdb-couch,alanning/couchdb-couch,KlausTrainer/couchdb-couch,apache/couchdb-couch,ngpestelos/couchdb-couch,cloudant/couchdb-couch,fkaempfer/couchdb,cloudant/couchdb-couch,smithsz/couchdb-couch,fkaempfer/couchdb,cloudant/couchdb-couch,ngpestelos/couchdb-couch,apache/couchdb-couch,fkaempfer/couchdb,smithsz/couchdb-couch,KlausTrainer/couchdb-couch,fkaempfer/couchdb