Colorize task names
Colorize task names

By default, differentiate task names with colors whenever they are
printed to the console.  Use red when stopping, green when starting and
yellow for existing task or other scenarios.  Add --no-color flag to
print names without color.  Remove backticks from output.  Update tests
to use --no-color.
Merge pull request #11 from MattHulse/colorize_tasks

Colorize tasks