Feature: Auth Ready, resolves IBM/unity-sdk-core#32

[Esam-Bustaty]

Added Authenticator.IsDoneInitializing field so

while (!service.Authenticator.CanAuthenticate())
    yield return null;

can become:

while (!service.Authenticator.IsDoneInitializing)
    yield return null;

if (!service.Authenticator.CanAuthenticate())
{
    // authentication failed
}
else
{
    // authentication succeeded
}

[mamoonraja]

Left one question, overall it does look fine. I will take some time out to do some testing before approving today. Once again thanks a lot for the PR.

[mamoonraja]

Should isDoneInitializing be called after we throw the error?

[Esam-Bustaty]

Well, yes.

If we move the new line a few lines down (inside else statement) so it's not called when an error happens, then there would be no way left for a consumer class to know if an error happened.

If you think this is not clear enough, maybe we should have an IsWaiting field instead, it would have the opposite value to IsDoneInitializing, and maybe makes thing more clear?