butterknife config

build.gradle (app)
apply plugin: 'com.android.application'
apply plugin: 'android-apt'

compile 'com.jakewharton:butterknife:8.0.1'
apt 'com.jakewharton:butterknife-compiler:8.0.1'

build.gradle (project)
buildscript {
repositories {
  jcenter()
}
  dependencies {
    classpath 'com.android.tools.build:gradle:2.1.3'
    classpath 'com.neenbedankt.gradle.plugins:android-apt:1.8'
    // NOTE: Do not place your application dependencies here; they belong
    // in the individual module build.gradle files
  }
}