Authors: Justin Ethier <https://github.com/justinethier> Contributors: Clint Moore <clint@ivy.io> Josh Triplett <josh@joshtriplett.org> Arseniy <https://github.com/Rotsor> Eli Barzilay <eli@barzilay.org> Ricardo Lanziano <ricardo.lanziano@gmail.com> References: Write Yourself a Scheme in 48 Hours <http://en.wikibooks.org/wiki/Write_Yourself_a_Scheme_in_48_Hours> R5RS <http://www.schemers.org/Documents/Standards/R5RS/HTML/> CHICKEN <http://www.call-cc.org/> Chibi-Scheme <http://code.google.com/p/chibi-scheme/>