title: Adding kapt to use Room causes compile errors
body: <p>I added <code>apply plugin: 'kotlin-kapt'</code> to be able to use Rooms annotation proccessor:</p>
  
  <pre><code>compile "android.arch.persistence.room:runtime:1.0.0"
  kapt "android.arch.persistence.room:compiler:1.0.0"
  </code></pre>
  
  <p>However when I build my project I get:</p>
  
  <pre><code>Folder C:\Users\...\app\build\generated\source\kaptKotlin\debug
  
  
  Folder C:\Users\...\app\build\generated\source\kaptKotlin\release
  
  
  3rd-party Gradle plug-ins may be the cause
  </code></pre>
  
  <p>If I get rid of <code>kapt</code> and simply use <code>annotationProcessor</code> instead. The app crashes saying:</p>
  
  <blockquote>
    <p>java.lang.RuntimeException: cannot find implementation for
    com.example..data.database.Appdatabase.
    Appdatabase_Impl does not exist</p>
  </blockquote>
  
  <p>Any ideas on how to use Room</p>