add codes to download a pre-built ivy cache to prime the local cache
add codes to download a pre-built ivy cache to prime the local cache

Javilete/buildpack,yannickdeturck/heroku-buildpack-scala,agideon/heroku-buildpack-scala,Luze26/heroku-buildpack-scala,hpcloud/heroku-buildpack-scala,Sage-Bionetworks/heroku-buildpack-scala,yannickdeturck/heroku-buildpack-scala,Sage-Bionetworks/heroku-buildpack-scala,Scalingo/scala-buildpack,Luze26/heroku-buildpack-scala,hpcloud/heroku-buildpack-scala,phdezann/heroku-buildpack-scala,KimStebel/heroku-buildpack-scala,Scalingo/scala-buildpack,phdezann/heroku-buildpack-scala,agideon/heroku-buildpack-scala,KimStebel/heroku-buildpack-scala,shunjikonishi/heroku-buildpack-scala-compiled,heroku/heroku-buildpack-scala,shunjikonishi/heroku-buildpack-scala-compiled,Javilete/buildpack,heroku/heroku-buildpack-scala