Update 71-apt-cacher-ng

So that I can use this repo instead of upstream to use local apt-cache NG
Delete unused code.
Dont download analysis data.
Update run script
Merge branch 'master' of github.com:akbargumbira/docker-realtime-inasafe
Dont use apt cache for production.
Add apt-cache ng to git ignore
Use lowercase for image name and use docker instead of docker.io
Update run script.
Resolve merge conflict.
Merge pull request #15 from akbargumbira/master

Some small work