Helper methods

[nateabele]

Implement httpAuth.status(): should return one of:

• httpAuth.NONE: Initial value, before any auth has been attempted
• httpAuth.WAITING: Failed requests have been queued, but no auth credentials have been supplied yet
• httpAuth.PENDING: Credentials have been set, but we're still waiting to see if a previously-failed request has returned
• httpAuth.SUCCEEDED: Authentication succeeded
• httpAuth.FAILED: Authentication failed, credentials should be updated before retrying

Implement httpAuth.attempts(): should count the number of times authentication has been attempted

[nateabele]

This will probably require requestQueue and httpAuth to share some state privately. I suggest wrapping their definitions in a self-executing function to accomplish this.