Add support lib version meta-data to AndroidManifest.xml

Any resulting app built with the support lib from
Gradle will have a meta-data tag added to their
AndroidManifest.xml, for example:

<meta-data android:name="android.support.VERSION"
           android:value="25.1.0" />

The value is automatically populated via the magic
of the Gradle build system.

BUG: 32171613
Test: manual (generate APK and inspect in AS APK Analyzer)
Change-Id: I00929a6e47195901598761bd3145f30a4a8b764a
26 files changed