fixing data bug when 401. also adding (err, result) node.js pattern for callbacks
breaking after error
not making a distinction between a single and multiple result makes it easier for application-land code to handle. This is useful when you'd want to keep a book open on every regid and its health.
updating README with new callback style
Version bump to 0.9.3

cherry-picked some commits from jondot-fork

fixes #12, fixes #14, fixes #15