Move to gradle 3.0, tools 2.2-beta1

Support lib was stuck in tools 2.2-alpha due to a bug in gradle 2.14
(tools 2.2-beta depends on gradle 2.14).

The bug is resolved in gradle 3.0 and tools team suggested us to move
to 3.0.

I've also added some sane defaults to gradle-properties to get faster
builds with in-process dexing and gradle daemon usage

Bug: 30160196
Gradle Bug: https://code.google.com/p/android/issues/detail?id=219034
Change-Id: I6a8c310dd252d160565b6bd57635a8d4ee41dc6b
5 files changed