In Bunit.bsh, instead of System.exit(-1) to fail, figure out a more elegant solution so after() and afterClass() are guarenteed to be called

We have some corner cases where ```System.exit(-1)``` is called:
* Duplicate test methods
* Exceptions denoted as expected but are not raised.

Need a more elegant solution so that we can cease execution of tests but ensure all ```after()``` and ```afterClass()``` methods are called.