title: Cannot resolve external dependency com.android.tools.build:gradle:2.2.2
body: <p>For some reason, travis <a href="https://travis-ci.org/RajuSE/mortar-evolution-stone/builds/199128927" rel="nofollow noreferrer">build</a> is having a hard time resolving dependencies.</p>
  
  <pre><code>A problem occurred configuring project ':app'.
  Could not resolve all dependencies for configuration ':app:_debugApk'.
  A problem occurred configuring project ':mortar'.
   Could not resolve all dependencies for configuration ':mortar:classpath'.
   Cannot resolve external dependency com.android.tools.build:gradle:2.2.2 because no repositories are defined.
  Required by:
  mortar-evolution-stone:mortar:unspecified
  </code></pre>
  
  <p><a href="https://travis-ci.org/RajuSE/mortar-evolution-stone/builds/199128927" rel="nofollow noreferrer">Travis Ci</a></p>