Unify mongo connection (#377)

* Unify mongo connection

the database name was inconsistent and the docker-compose image names as well
now every mongo connection string should be similar

it closes #322

* container-name: replace container name

it should be "db" instead of "mongo"

3. Installation/2. PaaS Deployments/Aliyun/README.md

@@ -102,7 +102,7 @@ db:
 web:
   image: rocketchat/rocket.chat
   environment:
-    - MONGO_URL=mongodb://db:27017/meteor
+    - MONGO_URL=mongodb://db:27017/rocketchat
     - ROOT_URL=http://your-ip-address:8818
   links:
     - db:db

3. Installation/2. PaaS Deployments/Google Compute Engine/README.md

@@ -12,7 +12,7 @@
 
 5. install a docker image for rocketchat and connect it to mongodb. `ROOT:URL` should be substituted your own:
 
-   `sudo docker run --name rocketchat -p 80:3000 --env ROOT_URL=https://www.test.com --env MONGO_URL=mongodb://db/meteor --link db -d rocketchat/rocket.chat`
+   `sudo docker run --name rocketchat -p 80:3000 --env ROOT_URL=https://www.test.com --env MONGO_URL=mongodb://db/rocketchat --link db -d rocketchat/rocket.chat`
 
    You are now runing rocket chat on compute engine. You can open a browser with the external IP of the instance.
 

3. Installation/3. Docker Containers/GenericLinux/docker-compose.yml

@@ -5,9 +5,9 @@ db:
     - ./data/dump:/dump
   command: mongod --smallfiles
 web:
-  image: rocketchat/rocket.chat 
+  image: rocketchat/rocket.chat
   environment:
-    - MONGO_URL=mongodb://db:27017/meteor
+    - MONGO_URL=mongodb://db:27017/rocketchat
     - ROOT_URL=https://rocketchat.test
     - MAIL_URL=smtp://USERNAME:PASSWORD@HOST:PORT/
   links:

3. Installation/4. Manual Installation/Windows 10 Pro/README.md

@@ -3,7 +3,7 @@
 Please make sure:
 
 * you have at least 4 GB of memory on your Windows 10 Pro machine
-* you are running 64 bit edition of Windows 10 Pro 
+* you are running 64 bit edition of Windows 10 Pro
 * you have the latest updates installed, and no updates pending
 * you have enabled Hyper-V (requires a reboot, go to Control Panel -> Add Windows Components -> Hyper-V)
 * you have at least 20 GB of disk space, preferably SSD
@@ -12,9 +12,9 @@ Please make sure:
 
 * Download and install [Docker for Windows](https://docs.docker.com/docker-for-windows/)
 * Create a file named `docker-compose.yml` that contains:
- 
+
 ```
-mongo:
+db:
   image: mongo:3.0
   command: mongod --smallfiles --oplogSize 128
 
@@ -23,7 +23,7 @@ rocketchat:
   environment:
     - PORT=3000
     - ROOT_URL=http://docker:3000
-    - MONGO_URL=mongodb://mongo:27017/rocketchat
+    - MONGO_URL=mongodb://db:27017/rocketchat
   links:
     - mongo:mongo
   ports: