Add automatic coloring

[cool-RR]

It'll be nice if the shell was using different colors so it'll be easier on the eyes. (e.g. one color for the prompt, one color for commands.)

[ri0t]

This is easily possible with prompt-toolkit>=2.0 - yet not with 1.0.15. I have created a fork that has this feature.

Because, yeah, my transparent dark terminals with pictures of space in the background really do not work well with black text... ;)

One thing it is still lacking (didn't quickly find out how to fix it) is that the commands descriptions are not styled, as well. Would be nice if someone had a pointer on how to do that.