Add contributing guide
Update 'go get' sequences; fix author line
Reword to clarify necessary tools, etc.
Simplify repo setups in Go workspace
Update README with reference to CONTRIBUTING.adoc
Merge pull request #48 from nhr/contributing_guide

Merged by openshift-bot
Update exposed APIs
Remove etcd from Dockerfile
Add images & image repositories

Add initial support for images & image repositories.

Add registry webhook to support adding images and tags
to image repositories when a registry's image repository
is updated.