added name to containerinfo
Merge pull request #12 from ehazlett/add-name-container-info

added name to containerinfo
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 to ContainerInfo
Add name parameter to CreateContainer
Fix PullImage
Add Content-Type to requests