Update to 1.4.0

This bump is required because all other versions suffer from the csrf
login issue - https://github.com/NodeBB/NodeBB/issues/5241

Dockerfile

@@ -5,7 +5,7 @@ ENV PATH /usr/local/node-4.2.6/bin:$PATH
 
 RUN mkdir -p /app/code
 WORKDIR /app/code
-RUN curl -L https://github.com/NodeBB/NodeBB/archive/v1.2.1.tar.gz | tar -xz --strip-components 1 -f -
+RUN curl -L https://github.com/NodeBB/NodeBB/archive/v1.4.0.tar.gz | tar -xz --strip-components 1 -f -
 ADD config.json.template /app/code
 RUN npm install --production
 RUN npm install nodebb-plugin-emailer-local-bobo