fix(tiller): save failed releases

When a release failed, the release record was not saved. That led to the
case where Kubernetes resources were deployed, but the release that
deployed them was not tracked.

To fix, we now save the release on failure. The 'helm delete' operation
can delete failed resources.

Closes #851

cmd/tiller/release_server.go

@@ -271,6 +271,9 @@ func (s *releaseServer) InstallRelease(c ctx.Context, req *services.InstallRelea
 	if err := s.env.KubeClient.Create(s.env.Namespace, b); err != nil {
 		r.Info.Status.Code = release.Status_FAILED
 		log.Printf("warning: Release %q failed: %s", name, err)
+		if err := s.env.Releases.Create(r); err != nil {
+			log.Printf("warning: Failed to record release %q: %s", name, err)
+		}
 		return res, fmt.Errorf("release %s failed: %s", name, err)
 	}