standardising docker deployment links and DB name

Dockerfile

@@ -27,8 +27,8 @@ USER rocketchat
 VOLUME /app/uploads
 WORKDIR /app/bundle
 
-# needs a mongoinstance - defaults to container linking with alias 'db'
-ENV MONGO_URL=mongodb://db:27017/meteor \
+# needs a mongoinstance - defaults to container linking with alias 'mongo'
+ENV MONGO_URL=mongodb://mongo:27017/rocketchat \
     PORT=3000 \
     ROOT_URL=http://localhost:3000 \
     Accounts_AvatarStorePath=/app/uploads

docker-compose.yml

-db:
+mongo:
   image: mongo
 # volumes:
-#    - ./data/runtime/db:/data/db
+#    - ./data/runtime/mongo:/data/mongo
 #    - ./data/dump:/dump
   command: mongod --smallfiles
 
@@ -12,9 +12,9 @@ rocketchat:
   environment:
     - ROOT=3000
     - ROOT_URL=http://yourhost:3000
-    - MONGO_URL=mongodb://db:27017/rocketchat
+    - MONGO_URL=mongodb://mongo:27017/rocketchat
   links:
-    - db:db
+    - mongo:mongo
   ports:
     - 3000:3000