title: Exoplayer(2.0.0) giving BehindLiveWindowException when playing live HLS video
body: <p>I am getting this exception after some time when I am playing a live video(HLS), for recorded videos it is working fine.</p>
  
  <pre><code>    com.google.android.exoplayer2.source.BehindLiveWindowException
      at com.google.android.exoplayer2.source.hls.HlsChunkSource.getNextChunk(HlsChunkSource.java:255)
      at com.google.android.exoplayer2.source.hls.HlsSampleStreamWrapper.continueLoading(HlsSampleStreamWrapper.java:313)
      at com.google.android.exoplayer2.source.CompositeSequenceableLoader.continueLoading(CompositeSequenceableLoader.java:55)
      at com.google.android.exoplayer2.source.hls.HlsMediaPeriod.continueLoading(HlsMediaPeriod.java:198)
      at com.google.android.exoplayer2.ExoPlayerImplInternal.maybeContinueLoading(ExoPlayerImplInternal.java:1080)
      at com.google.android.exoplayer2.ExoPlayerImplInternal.handleContinueLoadingRequested(ExoPlayerImplInternal.java:1067)
      at com.google.android.exoplayer2.ExoPlayerImplInternal.handleMessage(ExoPlayerImplInternal.java:289)
      at android.os.Handler.dispatchMessage(Handler.java:98)
      at android.os.Looper.loop(Looper.java:135)
      at android.os.HandlerThread.run(HandlerThread.java:61)
      at com.google.android.exoplayer2.util.PriorityHandlerThread.run(PriorityHandlerThread.java:40)
  </code></pre>