RBtools currently does not have the option for color to be displayed for warnings and errors.

I have changed the command-line UI, so that it defaults to color for warnings and errors, but 

allows the user to disable the feature if they do not wish to use it.

I added logging.warning, logging.critical, and used a command that would give an error to see

if color would be displayed. After that I used the --no-color command to turn off the color off.

Also, I ran the unit tests and it passed them.