build.gradle

// Top-level build file where you can add configuration options common to all sub-projects/modules.
buildscript {
    repositories {
        jcenter()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:2.3.3'
        classpath 'me.tatarka:gradle-retrolambda:3.6.1'
        classpath 'com.jakewharton:butterknife-gradle-plugin:8.6.0'
 
        // NOTE: Do not place your application dependencies here; they belong
        // in the individual module build.gradle files
    }
}

allprojects {
    repositories {
        jcenter()
        maven {
            url "https://jitpack.io"
        }
        maven {
            url "http://mvn.gt.igexin.com/nexus/content/repositories/releases/"
        }
    }
}

task clean(type: Delete) {
    delete rootProject.buildDir
}