Improved the logging of test failures on TravisCI

Travis CI output like this https://travis-ci.org/openMF/mifosx/builds/30501274 is quite useless (just name of failing test and exception's getMessage()), while e.g. https://travis-ci.org/openMF/mifosx/builds/30506366 which was built including this change is MUCH clearer (full stack trace, and more readable as no more funny characters on Travis non-ANSI TERM).

This PR improves that.