title: How to specify admob library in build.gradle?
body: <p>Can I specify the AdMob library in the build.gradle in Android Studio to avoid having the AdMob jar locally?</p>
  
  <p>I've tried </p>
  
  <pre><code>dependencies {
      compile 'com.google.ads:6.2.1+'
  }
  </code></pre>
  
  <p>but it doesn't work. Am I missing something?</p>