Add a build.gradle for gradle module
Use auto updatable android gradle

Declares dependency as: com.android.tools.build:gradle:0.4.+

https://plus.google.com/u/0/108967384991768947849/posts/ZWoLfsto98s
Merge commit 'bd701c6e3fbf26a9d5fbd4619301cc05e0d09caf'