Put config in a lexical variable to avoid calling method repeatedly.
Fix bug where an empty sequential test could break parallel tests.
Don't make it look like parallel tests have hung.

We do this by printing dots to STDERR at the end of every test method.
Add a "_color" attribute for console work. Add running_in_parallel method
Tidied.
Colorize red/green line of dots emitted by parallel testing.
Bump version number and update Changes.