Microsoft-CISL/REEF — pull request #770 by markusweimer (2014-04-25 19:28:01+00:00)
Title: Removed code deprecated in 0.3

This removes most APIs deprecated in 0.3 and removes their use:
* Removed `Failure.getCause()` and replaced all its uses
* Removed `JobMessageObserver.onError()` and replaced its use with thrown exceptions.
* Removed a deprecated constructor in `FailedJob` and subsequently removed `JobException`, which is no longer used.

Also, this fixes a small issue where we imported a deprecated `Assert` class from JUnit.
* Imported the right `Assert` from junit