4.2.0

Features

• Added ability to configure state persistence.

Fixes

• Added missing phoneNumber property on provideData objects.
• Fixed temporary error message when opening a popup for sign-in,
  prominent in some IE browsers.
• Refactored to not use navigator.onLine for offline detection as
  it is unstable in Cordova environments.
• Fixed an issue where database references were missing a toJSON
  method.