fix docker

nodejs/Dockerfile

@@ -1,9 +1,5 @@
 FROM node:4.4-onbuild
 EXPOSE 1207
-RUN apt-get install python-software-properties
-RUN add-apt-repository ppa:rwky/redis
-RUN apt-get update
-RUN apt-get install redis-server
 RUN redis-server
 RUN npm install -g forever
 ENTRYPOINT forever --spinSleepTime 1000 --minUptime 1000 index.js