Source: https://github.com/WhisperSystems/gradle-witness Git commit: 10f1269c0aafdc1d478efc005ed48f3a47d44278
Includes a fix for Gradle 2.+ that is not yet pulled in: https://github.com/WhisperSystems/gradle-witness/pull/3
https://github.com/WhisperSystems/gradle-witness