Disable Ivy debug-level logging (see elaboration below).  Fixes #635.
Disable Ivy debug-level logging (see elaboration below).  Fixes #635.

 The verbose-level logging is what usually contains relevant information for the user.
Persisting the debug logging slows down update noticeably and clutters the more useful
debug logging output from verbose.

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