Improve console output for multiple testsuites #65
Description
When specifying multiple files in test_path, the current output will just log Completed messages for each file, e.g. [Windows 8.1, Chrome 33.0] Completed... multiple times, for each file. The number of tests ran might vary, but that's not enough information.
This is less of a problem when something fails, where the test name and stack trace indicate which test suite is affected.