Add Project Template json schema

JSON schema for https://github.com/openshift/origin/pull/21.

@mfojtik @smarterclayton
@mfojtik Negative. Kubernetes also define "name" property, see: https://github.com/GoogleCloudPlatform/kubernetes/blob/master/examples/guestbook/frontend-controller.json#L20
^ But I don't get why "labels" is not defined as an array? Maybe upstream bug?