title: ext and project.ext have same scope in gradle?
body: <p>If I have below Android gradle script;</p>
  
  <pre><code>ext {
      compileSdkVersion = 25
  }
  
  android {
      compileSdkVersion project.compileSdkVersion 
  }
  </code></pre>
  
  <ol>
  <li><p>Does <code>ext {...}</code> have same scope as <code>project.ext {...}</code>?</p></li>
  <li><p>Does below two have same scope?</p>
  
  <ul>
  <li><code>compileSdkVersion project.compileSdkVersion</code></li>
  <li><code>compileSdkVersion this.compileSdkVersion</code></li>
  <li><code>compileSdkVersion compileSdkVersion</code> - Nope. this gives error</li>
  </ul></li>
  </ol>