Add HostConfig to StartContainer(..)
Add ErrNotFound to indicate 404s

This is necessary to figure out of a request failed or a resource (like
a container) is just not available.
Update types to current types in Docker
Add name parameter to CreateContainer
Fix PullImage
Add Content-Type to requests
Merge pull request #11 from discordianfish/add-host-config-start

A bunch of things..