Failing to include com.typesafe in build.sbt (for Scala and spray on Heroku)

Question

Trying to bootstrap my boilerplate Scala Spray project on Heroku, I am trying to add the necessary tweaks to my local project as per the Heroku documentation. The spray boil

Answer 1

Looks like this combination works with sbt 0.12.0 but not 0.12.4 nor 0.13.0.... changing the sbt project to 0.12.0 makes it work.