safeString helper
encodeURI and decodeURO helpers moved into helpers-url.{coffee,js}
ROADMAP helper, works similar to changelog helper
fixed highlight helper, now properly accepts a second paramer to override the highlight class. updatd code comments
new "include" helper, for pulling in external files, similar to partials but can manipulated from build config.  renamed old section helper to chapter, then renamed defineSection to 'section', and renderSection to 'override'
reorganized html helpers, minor cleanup
reorganized html helpers, minor cleanup. bumped version, rebuild