add setServiceUrl method as a setter for the serviceUrl property (#41) (cfb188f)
add specific error handling for SSL errors with cloud private instances (#54) (056ec9a)
export UserOptions interface from the BaseService (#50) (4f0075a)
implement new authenticators to handle sdk authentication (#37) (f876b6d)
refactor core to use Promises instead of callbacks (#55) (9ec8afd)

None of the authenticators or request methods take callbacks as arguments anymore - they return Promises instead.
Users that have credential files in both the working directory and the home directory will see a change in which one is used.
The internal property url no longer exists on the baseOptions object, it has been renamed to serviceUrl
The old style of passing credentials to the base service will no longer work. An Authenticator instance MUST be passed in to the base service constructor.
token managers no longer support user access tokens. use BearerTokenAuthenticator instead
The class names of the token managers have changed.
Icp4dTokenManagerV1 renamed to Cp4dTokenManager
IamTokenManagerV1 renamed to IamTokenManager
JwtTokenManagerV1 renamed to JwtTokenManager
The public method setAuthorizationInfo is renamed to setClientIdAndSecret
The response body is no longer the 2nd callback argument, the detailed response is. The body is located under the result property. The data property is removed.
This SDK may no longer work with applications running on Node 6 or 8.