Update Android Gradle plug-in to 2.1.3
Update Android Gradle plug-in to 2.1.3

felipecsl/stetho,facebook/stetho,blavalla/stetho,potyl/stetho,felipecsl/stetho,facebook/stetho,rickbrew/stetho,facebook/stetho,facebook/stetho,rickbrew/stetho,potyl/stetho,blavalla/stetho,rickbrew/stetho,felipecsl/stetho,potyl/stetho,blavalla/stetho,potyl/stetho,rickbrew/stetho,felipecsl/stetho,blavalla/stetho