title: ShowcaseView is not working without ActionBar
body: <p>Is there any way to use <a href="https://github.com/amlcurran/ShowcaseView" rel="nofollow">ShowcaseView</a> if the application has a theme    Theme.AppCompat.Light.NoActionBar and using android.support.v7.widget.Toolbar in the application. I am getting below stack trace while executing the app. Please suggest... </p>
  
  <pre><code>java.lang.RuntimeException: insertShowcaseViewWithType cannot be used when the theme has no ActionBar
          at com.github.amlcurran.showcaseview.targets.AppCompatReflector.getHomeButton(AppCompatReflector.java:32)
          at com.github.amlcurran.showcaseview.targets.AppCompatReflector.getActionBarView(AppCompatReflector.java:20)
          at com.github.amlcurran.showcaseview.targets.ActionViewTarget.setUp(ActionViewTarget.java:22)
          at com.github.amlcurran.showcaseview.targets.ActionViewTarget.getPoint(ActionViewTarget.java:29)
          at com.github.amlcurran.showcaseview.ShowcaseView$1.run(ShowcaseView.java:149)
          at android.os.Handler.handleCallback(Handler.java:739)
          at android.os.Handler.dispatchMessage(Handler.java:95)
          at android.os.Looper.loop(Looper.java:135)
          at android.app.ActivityThread.main(ActivityThread.java:5312)
          at java.lang.reflect.Method.invoke(Native Method)
          at java.lang.reflect.Method.invoke(Method.java:372)
          at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:901)
          at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:696)
  </code></pre>