title: Gradle delete task not working as expected
body: <p>I am trying to delete a temporary file created in my project. I used the following build file</p>
  
  <pre><code>apply plugin: 'java'
  apply from: 'https://github.com/valkolovos/gradle_cobertura/raw/master/repo/gradle_cobertura/gradle_cobertura/1.0/coberturainit.gradle'
  
  sourceCompatibility = 1.6
  
  dependencies {
      testCompile group: 'junit', name: 'junit', version: "4.+" 
  }
  
  repositories {
      mavenCentral()
  }
  
  task deleteStuff(type: Delete) {
      delete 'testfile.txt'
  }
  
  defaultTasks 'cobertura'
  </code></pre>
  
  <p>But the testfile.txt is not getting deleted.Anything i am missing?</p>