Version Upgrade Alerts

Version upgrade alerts should be shown when user opens the app in a snack bar with 2 options - upgrade and dismiss (for android there is no dismiss button, user can slide to dismiss the message)

The snackbar does not persist

We will also have snack bars for version upgrades with different text, ie. A new version of the app is now available

**NOTE: Text is not final, we need to run it by Carol