Update versions for build dependencies This updates Gradle wrapper and Android Gradle Plugin. './gradlew assembleDebug' passes in every project in project.txt (after './gradlew preflight' if necessary). LICENSE was modified in Change-Id: I0b7143eadf2eb17b1ebf0b58e84286f9f87283d9 Test: './gradlew preflight && assembleDebug' in all projects Bug: 122916118 Change-Id: I51f02b1fa5740090d8e75850df54053bb0440863