Revert "Update to Gradle 3.2."

Because the branch is master we cannot have different
version used in different branches (studio-master-dev
vs studio-feature-*) which is a problem!

This reverts commit cde199d0c8e5b0c6ad3e561d3f367aa74aa5c1f4.

Change-Id: I927a040ce2b2692b74bcb2d8ac4c0a359b7f9cf7
6 files changed