Downgraded Gradle plugin

build.gradle

@@ -3,7 +3,7 @@ buildscript {
         jcenter()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:2.0.0-alpha1'
+        classpath 'com.android.tools.build:gradle:1.3.1'
         classpath 'com.github.dcendents:android-maven-gradle-plugin:1.3'
         classpath 'com.github.ben-manes:gradle-versions-plugin:0.11.3'
     }