v1.0.0 - Promise API, Typescript rewrite

BREAKING CHANGES

• API now uses promises instead of callbacks.
• Initialisation code has been removed from the ADAuth constructor.
  If using the constructor, .initialise(), which returns a promise, must be called afterwards. Alternatively, you can use await ADAuth.create(options).

Added

• Automated testing, both unit and integration tests.

Changed

• Project migrated to typescript.
• Package manager switched to yarn.

Removed

• Admin client removed, as it is not used in the AD authentication flow. All operations against the server are performed using the user client.

Fixed

• Errors from the server are now properly passed to the client.