Signed-off-by: Adam Reese <adam@reese.io>

ref(chartutil): move chart loading out of chartutil into new package
    add chart loader interface to allow lazy loading
feat(chart): create chart accessors
ref(*): cleanup requirements
ref(tiller): remove optional template engines
ref(tiller): simplify sorting releases and hooks
ref(*): code simplification
ref(hapi): move chart package out of hapi
ref(chart): add requirements and lock to Chart struct

To match the convention of `helm install`, `helm uninstall` is the inverse.

Other tangential changes in this PR:

- StatusDeleting has been changed to StatusUninstalling
- StatusDeleted has been changed to StatusUninstalled
- `helm list --deleted` has been changed to `helm list --uninstalled`
- `helm list --deleting` has been changed to `helm list --uninstalling`
- `helm.DeleteOption` and all delete options have been renamed to `helm.UninstallOption`

I have not made any changes to the "helm.sh/hook-delete-policy", "pre-delete" and "post-delete" hook annotations because

1. it's a major breaking change to existing helm charts, which we've commited to NOT break in Helm 3
2. there is no "helm.sh/hook-install-policy" to pair with "helm.sh/hook-uninstall-policy", so delete still makes sense here

`helm delete` and `helm del` have been added as aliases to `helm uninstall`, so `helm delete` and `helm del` still works as is.

https://github.com/kubernetes-helm/community/blob/master/helm-v3/003-state.md#namespacing-changes

  1. install command loads chart archive.
  2. invokes helm api to transform the pkg/chart.Chart type
     to it's proto model.
  3. the client then establishes a connection to tiller.
  4. sends InstallReleaseRequest, receives InstallReleaseResponse.

todo (for complete install):
  - walk pkg/chart.{Values,Deps,Templates} types and populate proto
    definitions for various apis/messages.

So far, they just have basic readiness checks.