Don't rewrite RunFromSource.classpath every time
Don't rewrite RunFromSource.classpath every time

In the sbt project, we often spuriously re-doc a number of projects that
haven't changed because we modify a file in the resource path.

sbt/sbt,sbt/sbt,sbt/sbt,sbt/sbt,mdedetrich/sbt,mdedetrich/sbt,mdedetrich/sbt,xuwei-k/xsbt,sbt/sbt,xuwei-k/xsbt,mdedetrich/sbt,sbt/sbt,xuwei-k/xsbt,xuwei-k/xsbt,mdedetrich/sbt,mdedetrich/sbt,xuwei-k/xsbt,sbt/sbt,mdedetrich/sbt