title: Unity keeps deleting the google-play-libs folder in plugins and not working
body: <p>I recently installed Unity 5.3.3 on a new computer, and I have set up Google Play Games Services. However, it does not automatically import the google-play-libs folder into assets>plugins>android.</p>
  
  <p>To build successfully, I have to manually import the library and then build, but whenever I close and open Unity again, it keeps getting deleted and I have to continuously import it before every build.</p>
  
  <p>Does anyone know how to fix the issue? I am using the 0.9.31a version of the plugin. One thing to note is that I get the error: Cannot find candidate artifact for com.android.support:appcompat-v7:23.1.0+
  I read to fix it I must get the Android Support Repository in the SDK manager, but in mine it is not there, I only have Android Support Library.</p>
  
  <p>Also, signing in with google does not work on the app itself.
  I get the ADB logcat error:</p>
  
  <pre><code>I/GamesNativeSDK( 8741): Auth operation started: SIGN IN
  I/GamesNativeSDK( 8741): Connecting to Google Play...
  E/GamesNativeSDK( 8741): Not authorizing: no client.
  I/Unity   ( 8741): AuthState == Unauthenticated calling auth callbacks with fail
  ure
  I/Unity   ( 8741):
  I/Unity   ( 8741): (Filename: ./artifacts/generated/common/runtime/UnityEngineDe
  bugBindings.gen.cpp Line: 37)
  I/Unity   ( 8741):
  I/Unity   ( 8741): Error sign in
  I/Unity   ( 8741):
  I/Unity   ( 8741): (Filename: ./artifacts/generated/common/runtime/UnityEngineDe
  bugBindings.gen.cpp Line: 37)
  I/Unity   ( 8741):
  </code></pre>
  
  <p>@Clayton Wilkinson Please Help!</p>
  
  <p>Any help is greatly appreciated, thanks.</p>