More MongoLab config tweaks

config/mongo.yml

@@ -1,20 +1,15 @@
 defaults: &defaults
+  host: 127.0.0.1
   port: 27017
 
 development:
   <<: *defaults
-  host: 127.0.0.1
   database: apollo_development
 
 test:
   <<: *defaults
-  host: 127.0.0.1
   database: apollo_test
 
 # set these environment variables on your prod server
 production:
-  <<: *defaults
-  database: apollo
-  username: <%= ENV['MONGO_USERNAME'] %>
-  password: <%= ENV['MONGO_PASSWORD'] %>
   uri: <%= ENV['MONGOLAB_URI'] %>