Added example program "Rational".
Added example program "Rational".

sbt/sbt,xuwei-k/xsbt,mdedetrich/sbt,sbt/sbt,sbt/sbt,sbt/sbt,mdedetrich/sbt,sbt/sbt-launcher-package,schleichardt/sbt-extras,mdedetrich/sbt,sbt/sbt,mdedetrich/sbt,BanzaiMan/sbt-extras,yeghishe/sbt-extras,xuwei-k/xsbt,sbt/sbt,mdedetrich/sbt,sbt/sbt-launcher-package,xuwei-k/xsbt,sbt/sbt,xuwei-k/xsbt,mdedetrich/sbt,mdedetrich/sbt,xuwei-k/xsbt