Added a unit test to attempt to reproduce issue #63.  Maybe I don't understand the issue because I wasn't able to reproduce it.
Hoping to reproduce the issue by calling System.exit() in a method instead of main.  No dice.
Merge pull request #71 from DavidWhitlock/issue-63

Added a unit test that verifies that code after a System.exit is, indeed, not executed. This was to help diagnose issue #63.