* Add logic for platform specific commands to plugins
* Add plugins doc updated to incorporate platform specific commands
* Add condition for os match: If OS matches and there is no more specific match, the command
will be executed
It is now possible to create plugins with chart download capabilities for custom, non-http protocols.
Furthermore it is possible to reuse helm packages to implement alternative clients with these custom downloader functions.
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