title: Failed to get request token on Android M running Devices
body: <p>Twitter login failed in Android 6.0 preview devices. Its working fine on all other devices. </p>
  
  <p>Below code is used to initialize fabric with twitter.</p>
  
  <p>TWITTER_ KEY and TWITTER_SECRET keys were obtained from twitter app settings.</p>
  
  <pre><code>    TwitterAuthConfig authConfig = new TwitterAuthConfig(TWITTER_KEY, TWITTER_SECRET);
      Fabric.with(this, new Twitter(authConfig));
  </code></pre>
  
  <p>Here is the error log i got during login using TwitterApiClient.</p>
  
  <pre><code>  08-31 07:52:09.988 4692-4692/? E/Twitter: Failed to get request token
    08-31 07:52:09.988 4692-4692/? E/Twitter: com.twitter.sdk.android.core.TwitterApiException: 401 Authorization Required
    08-31 07:52:09.988 4692-4692/? E/Twitter: at retrofit.RestAdapter$RestHandler.invokeRequest(RestAdapter.java:383)
    08-31 07:52:09.988 4692-4692/? E/Twitter: at retrofit.RestAdapter$RestHandler.access$100(RestAdapter.java:220)
    08-31 07:52:09.988 4692-4692/? E/Twitter: at retrofit.RestAdapter$RestHandler$2.obtainResponse(RestAdapter.java:278)
    08-31 07:52:09.988 4692-4692/? E/Twitter: at retrofit.CallbackRunnable.run(CallbackRunnable.java:42)
    08-31 07:52:09.988 4692-4692/? E/Twitter: at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1113)
    08-31 07:52:09.988 4692-4692/? E/Twitter: at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:588)
    08-31 07:52:09.988 4692-4692/? E/Twitter: at retrofit.Platform$Android$2$1.run(Platform.java:142)
    08-31 07:52:09.988 4692-4692/? E/Twitter: at java.lang.Thread.run(Thread.java:818)
    08-31 07:52:10.000 4692-4692/? E/Twitter: Authorization completed with an error
    08-31 07:52:10.000 4692-4692/? E/Twitter: com.twitter.sdk.android.core.TwitterAuthException: Failed to get request token
    08-31 07:52:10.000 4692-4692/? E/Twitter: at com.twitter.sdk.android.core.identity.OAuthController$1.failure(OAuthController.java:95)
    08-31 07:52:10.000 4692-4692/? E/Twitter: at com.twitter.sdk.android.core.internal.oauth.OAuth1aService$1.failure(OAuth1aService.java:215)
    08-31 07:52:10.000 4692-4692/? E/Twitter: at com.twitter.sdk.android.core.Callback.failure(Callback.java:45)
    08-31 07:52:10.000 4692-4692/? E/Twitter: at retrofit.CallbackRunnable$2.run(CallbackRunnable.java:53)
    08-31 07:52:10.000 4692-4692/? E/Twitter: at android.os.Handler.handleCallback(Handler.java:739)
    08-31 07:52:10.000 4692-4692/? E/Twitter: at android.os.Handler.dispatchMessage(Handler.java:95)
    08-31 07:52:10.000 4692-4692/? E/Twitter: at android.os.Looper.loop(Looper.java:148)
    08-31 07:52:10.000 4692-4692/? E/Twitter: at android.app.ActivityThread.main(ActivityThread.java:5417)
    08-31 07:52:10.000 4692-4692/? E/Twitter: at java.lang.reflect.Method.invoke(Native Method)
    08-31 07:52:10.000 4692-4692/? E/Twitter: at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
    08-31 07:52:10.000 4692-4692/? E/Twitter: at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
  </code></pre>