Fix the registry section of the README
Make docker-builder and sti-builder use Centos 7 base image
Apply error handling
Merge pull request #193 from mfojtik/centos_image

Merged by openshift-bot
Merge pull request #168 from jhadvig/error_handling

Merged by openshift-bot
Allow OpenShift to start in roles master and node

* Adds `openshift start master` and `openshift start node` as options
* Use --listen to specify the address to listen on, --master as the public
  reachable address, and --etcd as the URL to the etcd server
* More intelligently default addresses based on user input
* Split startup code into separate packages for cleaner isolation
Update examples