ext.postBuildExtras = {
    android {
        compileOptions {
            sourceCompatibility JavaVersion.VERSION_1_7
            targetCompatibility JavaVersion.VERSION_1_7
        }
        allprojects {
            compileOptions {
                sourceCompatibility = JavaVersion.VERSION_1_7
                targetCompatibility = JavaVersion.VERSION_1_7
            }
        }
    }
}