Commits on Oct 28, 2013

1. Allow fail messages to be caught, and introduce the Any trait …

   Some code cleanup, sorting of import blocks
   
   Removed std::unstable::UnsafeArc's use of Either
   
   Added run-fail tests for the new FailWithCause impls
   
   Changed future_result and try to return Result<(), ~Any>.
   
   - Internally, there is an enum of possible fail messages passend around.
   - In case of linked failure or a string message, the ~Any gets
     lazyly allocated in future_results recv method.
   - For that, future result now returns a wrapper around a Port.
   - Moved and renamed task::TaskResult into rt::task::UnwindResult
     and made it an internal enum.
   - Introduced a replacement typedef `type TaskResult = Result<(), ~Any>`.

   

   Kimundi committed Oct 28, 2013
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