Forced the tests to run in parallel in different forked JVMs since NCubeManager Persister is a static class that gets reused.
Updated maven surefire settings to better support static class NCubeManager
Updated tests for case  where cube doesn't exist and SQLException
Added in restore cube and delete cube exception case tests (with todo on impossible to reach area).
Merge pull request #86 from kpartlow/master

Changed maven settings to use forked vms and updated test coverage