title: Integrating Crashlytics to library project
body: <p>I have a library project (a custom view library project) which doesn't have any Activities/services. I want to integrate Crashlytics SDK to my library. When I try to add it via Crashlytics plugin (the icon in toolbar) for Android Studio, it just stays on <code>"Checking"</code> for <code>"Select a kit to install"</code>. 
  The question is how can I add Crashlytics to my Android library project?</p>
  
  <p>Best Regards</p>