Upgrade Google Analytics v2 to v3

[eyedol]

See this doc for how to migrate to v3 https://developers.google.com/analytics/devguides/collection/android/v3/migration

[eyedol]

Wanted to upgrad to v4 but it requires us dropping support for Android 8 users. Looking at our stats ,we've a bit of users on Froyo. Sticking to v3 for now.