Maven pom refers to incorrect support library version

Created by: hborders

We should use the support library naming standard from maven-android-sdk-deployer which seems to be the best way to deploy the support libraries into a maven repository. Currently, we refer to com.android.support:support-v4:13.0.0, which I think is actually supposed to correspond to $ANDROID_HOME/extras/android/support/v13/android-support-v13.jar. maven-android-sdk-deployer calls that com.google.android:support-v13:19.0.1 It uses the version reported from the Android SDK Manager, and we should do the same.

I'll submit a PR later tonight.