Removed localhost as global default server

config/mongo.yml

@@ -1,13 +1,14 @@
 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