gradle - Gradle: thorntail プラグインが見つかりません

Question

私はここでthorntailの例を見てきました。

私はこのプロジェクトを作成しました：

frontoffice
├── gradle.properties
├── build.gradle
└── gradle
    └── thorntail.gradle

thorntail.gradleは：

buildscript {
  String thorntailVersion = System.getProperty('thorntailVersion') ?: VERSION_THORNTAIL

  repositories {
    mavenLocal()
    mavenCentral()
    maven {
      url "https://oss.sonatype.org/content/repositories/snapshots/"
    }
  }

  dependencies {
    classpath "io.thorntail:thorntail-gradle-plugin:$thorntailVersion"
  }
}

とbuild.gradle:

apply from: "$projectDir/gradle/thorntail.gradle"
apply plugin: 'thorntail'

私は得ています：

➜  prjt git:(master) ✗ gradle clean compile

FAILURE: Build failed with an exception.

* Where:
Build file '/home/jeusdi/projects/espaidoc/frontoffice/build.gradle' line: 10

* What went wrong:
A problem occurred evaluating project ':frontoffice'.
**> Plugin with id 'thorntail' not found.**

何か案は？