Removes println when removing unused *.class files.
Removes println when removing unused *.class files.

#1525 removes unused *.class files created by the metabuid.
The implementation currently prints out a long list of *.class files
it’s about to remove. Unless something bad happens, this information is
not very useful to the user, so I suggest we don’t display it.

Duhemm/sbt,xuwei-k/xsbt,jkinkead/sbt,mdedetrich/sbt,mdedetrich/sbt,dyx/sbt,mdedetrich/sbt,twitter-forks/sbt,sbt/sbt,dyx/sbt,Sciss/sbt,mdedetrich/sbt,adriaanm/sbt,sbt/sbt,mdedetrich/sbt,xuwei-k/xsbt,sbt/sbt,xuwei-k/xsbt,dyx/sbt,Duhemm/sbt,twitter-forks/sbt,sbt/sbt,twitter-forks/sbt,jasonchaffee/sbt,twitter-forks/sbt,corespring/sbt,mdedetrich/sbt,xuwei-k/xsbt,jkinkead/sbt,twitter-forks/sbt,dyx/sbt,dansanduleac/sbt,mdedetrich/sbt,som-snytt/xsbt,pocketberserker/sbt,sbt/sbt,sbt/sbt,Duhemm/compiler-bridge,sbt/sbt,dyx/sbt,jkinkead/sbt,pdalpra/sbt,jkinkead/sbt,xuwei-k/xsbt,jkinkead/sbt