v0.4.0

• Refactors display of errors/passing tests. Adds QUIET environment variable parsing. If true, display for passing tests will be more compact (not showing file/test names).
• Updates count for better accuracy in test results.
• Rescues SystemExit, Interrupt to actually exit the script
• Adds support for catch in tests: If the arguments to do include catch, then we are expecting an error, which should be caught and tested.