Updating to r4

Updating Android dependency.

Steps to test:
Update your SDK
Update your Maven SDK Deployer

delete ~/.m2/repository/android

run `mvn clean install` in the sdk deployer and then in -security.

If updating the SDK deployer fails, delete $ANDROID_HOME/add-ons/addon-google_apis-google-19-1 and rerun
Also make sure any android module dependencies are installed (-core etc)