Updated Google Analytics from v2 to v3

HI there! 

As we are trying to use the [Google Tags Manager](http://www.google.com/tagmanager/), we find that we have conflicting dex file errors occurring. After much digging we find that the root of the problem -- Google bundled the Google Tags Manager together with the latest Google Analytics v3 into a single `libGoogleAnalyticsServices.jar`, and it conflicts with the `libGoogleAnalyticsV2.jar` bundled with Segment.io. 

I changed `libGoogleAnalyticsV2.jar` to `libGoogleAnalyticsServices.jar`, updated the Google Analytics integration according to the [v3 API](https://developers.google.com/analytics/devguides/collection/android/v3/migration). Some things such as setUseSecure() has been removed from v3, but if you find it please let me know! 

So now users can have access to GAV3 and Google Tag Manager without having issues with conflicting libraries. 

I understand that GAV3 API is drastically different from the GAV2 API, and this might break the integration for many users. Perhaps you guys can consider releasing this as a breaking update?