Replacing actionDomain message.
Adding to _signinWithAuth0 an optional connection parameter.
Making call _signinPopupNoRedirect be called properly.
Making popupCallback override options.popupCallback.
Moving email parsing to OptionsManager.
Minor: Removing unused variables.
Simplifying and DRYing how strategies/connections are filtered.
Fixes #13: HRD Support for AD Connectors (widget side)