Easily convert from SerfResult to lists or tuples

Make it easier to convert from our custom result object to another
form that users might prefer like lists or tuples. There's no effort
made to do the equivalent for dictionaries as the object already
exposes all keys that it would as a dict().
Bump version to v0.1.0

Increasing on minor version as there's a breaking change to the API
with how SerfConnection (and by proxy SerfClient) objects return
responses from agents. They're now bounded using SerfResult objects.