Sets Black to Black and Grey to Grey and SceenColors to Black

Noticed this when trying to set color bash variables for prompt building and such.

Included a few git-bash scripts to demonstrate what is going on. It became clear running ansi.sh that the extra background around most of the target colors was out of sync. I believe this current version is closer in line with the original intent. Plus this let's you add to bashrc and do all kinds of fun script output colorization of your own.

Great stuff, thanks for working these out. My students and I really appreciate it. Makes working on a Windows machine not so bad.