Bug 951304 - Follow-up: Look better on tablets; improve interstitial. r=rnewman
Bug 956581 - Make FxAccountGetStartedActivity an AuthenticatorActivity. r=rnewman
Bug 951264 - COPPA support for Firefox Accounts on Android. r=rnewman
Bug 961184 - Show activity after signing in to account. r=rnewman

Also (partially) implements resending verification codes, but doesn't
yet implement resending after account creation.