Don't fail publishing on overwrite, but issue a warning.
Don't fail publishing on overwrite, but issue a warning.

Workaround for #1156.

* Creates a new FileRepository that will stil allow local files
  to be transfered if overwrite is true (non-snapshot module),
  but will issue a warning about deprecated behavior.
* Ensure warning is long enough to annoy people into asking
  what it's about.

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