Sample library doesn't reference mvn script

[AttwellBrian]

Bottom of sample libraries should have

apply from: rootProject.file('gradle/gradle-mvn-push.gradle')

Without this, calling uploadArchives won't have an effect.

[AttwellBrian]

Once you fix this you'll also need to tweak the javadoc task. Otherwise you'll notice that the javadoc task throws a ton of errors.

For example: NullAway has javadoc { abortOnError false } in it. But there is probably a better solution.