adding colors to the text output during an etch run

[poblahblahblah]

this colorizes the following:

red:

• test failures
• post failures
• all other raises and errors[1]

green:

• setup commands (the actual command that will be run)
• pre commands (the actual command that will be run)
• test commands (the actual command that will be run)
• post commands (the actual command that will be run)

yellow:

• warnings

blue:

• diff output

1 - I think I tracked them all down. there were a few that I was unsure of whether they could be colorized and I didn't really have a way to trigger them, so I played it safe and left them without color. I might need some help finding the things I missed that were not obvious.