This commit adds --kube-version flag to helm template. It allows you to
override the Kubernetes version used as Capabilities.KubeVersion.Major/Minor (e.g. 1.7).
f.StringVar(&t.namespace,"namespace","","namespace to install the release into")
f.StringArrayVar(&t.values,"set",[]string{},"set values on the command line (can specify multiple or separate values with commas: key1=val1,key2=val2)")
f.StringVar(&t.nameTemplate,"name-template","","specify template used to name the release")
f.StringVar(&t.kubeVersion,"kube-version","","override the Kubernetes version used as Capabilities.KubeVersion.Major/Minor (e.g. 1.7)")