How to apply android-apt plugin from a shared gradle file using the fully qualified class name

dagger.gradle

buildscript {
    repositories {
        mavenCentral()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:1.0.1'
        classpath 'com.neenbedankt.gradle.plugins:android-apt:1.4'
    }
}

apply plugin: com.neenbedankt.gradle.androidapt.AndroidAptPlugin

dependencies {
    compile 'com.squareup.dagger:dagger:1.2.2'
    apt 'com.squareup.dagger:dagger-compiler:1.2.2'
}