mongodb is part of package.json now

Dockerfile

@@ -9,9 +9,6 @@ RUN curl -L https://github.com/NodeBB/NodeBB/archive/v1.0.3.tar.gz | tar -xz --s
 RUN npm install --production
 RUN rm -rf logs && ln -s /run/nodebb/logs /app/code/logs
 
-# usually the setup script installs this. keep in sync with src/install.js DATABASES/dependancies
-RUN npm install mongodb@~2.0.0 connect-mongo
-
 # these links will become valid after setup is run
 RUN rm -rf /app/code/config.json && ln -sf /run/nodebb/config.json /app/code/config.json