Add plugin management subcommands for installing and removing plugins
to `$HELM_HOST/plugins`.

Install accepts a vcs url or a local directory.

```
$ helm plugin install http://github.com/adamreese/helm-env
Installed plugin: env

$ helm plugin list
NAME    	VERSION	DESCRIPTION
env     	0.1.0  	Print out the helm environment.

$ helm plugin remove env
Removed plugin: env
```

closes #1977

fix (pkg/chartutil): correctly parse input values for ProcessRequirem…

feat/tls: Support optional TLS for helm / tiller

docs(plugins): add more helm plugin links

Trigger deployment as success when new replicaSet has reached min you need

fix(helm): add 'skip-refresh' flag to 'helm init'

Fixes a bug where tags and conditions specified in values.yaml were not being respeceted, causing incorrect loading of subcharts.

Closes #2139

feat(helm): import child values to parent

fix(glide.yaml): update SemVer to 1.2.3

fix(*): add missing proto for weight hook

Trigger deployment as success when new replicaSet has reached minimum you need which is number of replicas minus maxUnavailable

Separate manifests printed by "helm init" with YAML document boundary markers

There was a bug in SemVer 1.2.2 that miscalculated a couple of
comparison patterns.

Add more object kinds to sorted installation order

feat(helm): add support for repo alias

feat(hooks): Adds weighted hooks

feat(helm): add --reuse-values flag to upgrade

This makes it possible to re-use the existing values on an upgrade,
merging in any new values set by `-f` or `--set`.

Closes #1876

docs(related): Added podcast, plugin article

This exposes the skip-refresh flag to helm init to make it possible to
initialize Helm without fetching the index.yaml of the stable repo.
This mirrors the behavior of 'helm dep up's skip-refresh flag.

Closes #2127

fix(helm): manifests string parsing works for newlines in the manifests

support repo alias in requirements.yaml
The syntax should be like: "alias:reponame" or "@reponame".

closes: #1985

fix(tiller): fix helm status failure on missing resource

fix(helm): add --destination flag to 'helm package'

Fixes TestInstallRelease_VerifyOptions & TestUpdateRelease_VerifyOptions

Fix identation of `helm dep` help text

Fix codefences and nits in charts.md. Correct whitespace in charts. Add clarity to description of ImportValues requirements field.