Initial version of the plugin using the v4 SDK in Google Play Services.

Allows for easy IDFA / ADID support.

You will need Google Play Services to use this.  There is a menu added
that has a button that will copy it from the Android SDK directory you configured in
Unity to your project.

You can use the android tool from the Android SDK to download Google
Play Services.

Plugin doesn't have feature parity with v3 version yet. It only supports
events and screenviews. Existing v3 methods are stubbed
out, but don't do anything yet.

In Unity 4 the prefab isn't working, you can just create an
empty game object and attach the GoogleAnalyticsV4 script to it.

Author: baldwin628