This adds support for the following 'helm list' flags:

- all: show all release types
- deleted: show deleted releases
- deployed: show deployed releases
- failed: show failed releases

These flags can be toggled. Only '--deployed' is turned on by default.

On the server side, Tiller's list function can now filter based on a
slice of release.Status_Code filters. While the client only supports a
subset, the server supports all known release.Status_Code types.

Closes #973