Change docker repo

[eric-taix]

Hey,

Thanks so much for this tutorial.
Please note that dockerfile account has been removed: there is now 34 repos. Due to this change dockerfile (like /dockerfile/java:oracle-java8) are no more available. You have to change it to registry.hub.docker.com/_/java

More information about this change: http://blog.docker.com/2015/03/updates-available-to-popular-repos-update-your-images/

Keep the good work

[floer32]

forgotten?