Implement deployments with pods

Refactor the deployment mechanism to be exclusively pod based. Refactor
the deployment API accordingly. Improve test coverage, and provide the
foundational support for implementing more built-in deployment strategies.
Fix naming of openshift/origin-deployer image

Use consistent naming for the deployer image.
Update deployment API examples and docs
Merge pull request #382 from ironcladlou/deploy-pods

Merged by openshift-bot