feat(data): swagger server stub updates to version data

This includes the following changes to model data spec:

added a "type" property to component that represents the type of K8s resource (e.g., "Deployment", "Daemon Set")
changed the poorly named "data" swagger model definition to "versionData"; this maps to the "data" property in a version model, and is version-specific
added an "image" property to version data that represents the image string (e.g., "quay.io/deisci/builder:canary")

All of these changes result from an updated swagger spec here:

This implementation of the versions API successfully tested as backwards compatible w/ the following versions of workflow-manager:

deis / workflow-manager-api