Package/namespace is overidden even if specified in AndroidManifest.xml

[lwasyl]

The sample app doesn't compile at the following commit: e13dfa7

It looks like existing package in the AndroidManifest.xml is always overridden by the plugin. That's a behavior change compared to 1.x version, which did not overwrite the namespace. It makes bumping to 2.x a bit problematic, because all existing namespaces in XMLs now have to be migrated