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
661 files changed