Merge pull request #3 from richi235/master

Prettfiied Readme for nicer rendering on Github Page
added GPLv3 license file, close #2
use Scheme highlight syntax in README
added colorized prompt for #4
fixed module name display in prompt
backtrace level doesn't show in prompt, fixed
fix #5: Readline requires extra escape characters to tell it to ignore escape chars when calculating the prompt length
Merge pull request #7 from brandoninvergo/fix-readline-prompt

fix #5:
Thanks Brandon Invergo brandon@brandoninvergo.com