* stable/etcd-operator: Don't abide to cluster.enabled on install and bump version 0.2.1
Fixes#728. The issue is that the TPR will not exist until after the
etcd-operator runs, causing validation to fail when the etcd.coreos.com/v1beta1
API version doesn't exist. Since it must be run-post install, ignore the
setting when the Release is an install.
* Fixed minor README typos