Travis CI won't display build logs longer than 10,000 lines. Since we
have so many tests, our CI logs get truncated and you can't see the test
failures down at the end of the log.

Instead of printing each test on its own line, we now just print out a
single character for each test indiciating success (.), failure (F), or
that the test was ignored (I). Failing tests are still printed in full
at the end of the test run.