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).
This feature adds the ability to selectively control the loading of charts using entries in top chart's values.
When 'helm install --set tags.mytag=true', charts with that tag will be enabled unless disabled in parent by condition.
When 'helm install --set mychart.enabled=true', charts with that yaml path specified will be enabled.
Closes#1837