Add info about Docker 1.6 to README

CONTRIBUTING.adoc

@@ -35,7 +35,7 @@ Here's how to get set up:
 1. For Go, Git and optionally also Docker, follow the links below to get to installation information for these tools: +
 ** http://golang.org/doc/install[Installing Go]
 ** http://git-scm.com/book/en/v2/Getting-Started-Installing-Git[Installing Git]
-** https://docs.docker.com/installation/#installation[Installing Docker]
+** https://docs.docker.com/installation/#installation[Installing Docker]. NOTE: OpenShift now requires at least Docker 1.6. RPMs for Docker 1.6 are available for Fedora 21. If you are using CentOS 7, Docker 1.6 is not yet available in CentOS Extras yet. In the meantime, you will need to install it from https://mirror.openshift.com/pub/openshift-v3/dependencies/centos7/x86_64/docker-1.6.0-1.el7.x86_64.rpm.
 2. Next, create a Go workspace directory: +
 +
 ----

README.md

@@ -43,6 +43,11 @@ For more information on the security of containers, see these articles:
 Running untrusted containers will become less scary as improvements are made upstream to Docker and Kubernetes, but until then please be conscious of the images you run.  Consider using images from trusted parties, building them yourself on OpenShift, or only running containers that run as non-root users.
 
 
+Docker 1.6
+----------
+OpenShift now requires at least Docker 1.6. RPMs for Docker 1.6 are available for Fedora 21. If you are using CentOS 7, Docker 1.6 is not yet available in CentOS Extras yet. In the meantime, you will need to install it from https://mirror.openshift.com/pub/openshift-v3/dependencies/centos7/x86_64/docker-1.6.0-1.el7.x86_64.rpm.
+
+
 Getting Started
 ---------------
 The simplest way to run OpenShift Origin is in a Docker container: