Add analytics extra v2

Now to use analytics extra v1 or v2 you have to specify the correct version:

```
For the Google Analytics extra (ATTENTION! Do NOT use provided scope!!)

Google Analytics V1 (old)

<dependency>
  <groupId>com.google.android.analytics</groupId>
  <artifactId>analytics</artifactId>
  <version>2</version>
</dependency>

Google Analytics V2

<dependency>
  <groupId>com.google.android.analytics</groupId>
  <artifactId>analytics</artifactId>
  <version>3</version>
</dependency>

```