Feature Request: return errors to stderr instead of stdout

[Band-Aid]

box cli returns all http status errors returned from box (>400) to stdout instead of stderr

This makes it difficult to handle exceptions since I need to parse each JSON response returned to the standard output.
If http errors could be returned to stderr this would make it a lot easier to handle errors within my script.

[allenmichael]

This issue should be fixed with this current release v1.2.0 @Band-Aid