SitrepActivity can result in too many queued tasks

[codeka]

The end result is the below exception. I'm not sure if the best solution is to just allow "infinite" (or at least, more) queued tasks, or to somehow limit the number of stars we try to fetch some other way.

java.util.concurrent.RejectedExecutionException: Task au.com.codeka.d@439ec898 rejected from java.util.concurrent.ThreadPoolExecutor@41cbfd58[Running, pool size = 20, active threads = 20, queued tasks = 250, completed tasks = 254]
    at java.util.concurrent.ThreadPoolExecutor$AbortPolicy.rejectedExecution(ThreadPoolExecutor.java:1979)
    at java.util.concurrent.ThreadPoolExecutor.reject(ThreadPoolExecutor.java:786)
    at java.util.concurrent.ThreadPoolExecutor.execute(ThreadPoolExecutor.java:1307)
    at au.com.codeka.BackgroundRunner.[execute|onComplete|access$100|access$200](SourceFile:88)
    at au.com.codeka.warworlds.model.StarManager.[clearCache|getStarSummary|getStarSummary|getStarSummaries$33f58d9f|notifyStarUpdated|refreshStar|refreshStarSummaries|renameStar|requestStar|access$200](SourceFile:178)
    at au.com.codeka.warworlds.model.ek.a(SourceFile:60)
    at au.com.codeka.warworlds.model.ek.a(SourceFile:50)
    at au.com.codeka.warworlds.game.SitrepActivity$SituationReportAdapter.getView(SourceFile:500)
    at android.widget.AbsListView.obtainView(AbsListView.java:2680)
    at android.widget.ListView.makeAndAddView(ListView.java:1838)
    at android.widget.ListView.fillDown(ListView.java:681)