TODOs: use Android SDK Manager for cmdline gradlew to work

Otherwise, ANDROID_HOME or sdk.dir will be considered missing and
gradle will fail.

Worse, gradle is now on 2.0.0 instead of 1.5.0, so the usual sdk
manager has to be obtained in a non-standard way.

Change-Id: Id46153c7b7ca80c462d7b9711a580c0745e93d47
2 files changed