[Android] Analytics: Upgraded to support Version 2 of the Analytics SDK

### NOV, 14, 2012 ###

* Upgraded to support Version 2 of the Google Analytics SDK
* Added the `stop` method
* Set it to use `EasyTracker`
* Removed Support for `setCustomVar` as the SDK no longer supports it

https://developers.google.com/analytics/devguides/collection/android/v2/migration

Should Close: #881, #483, #874, #758