Wip/h3nk3 improved instructions

Only prints instructions for how to run upon successful cloning of the template.
I actually prefer my message over the one displayed in the ProcessFailure:
 "Failed to download http://downloads.typesafe.com/typesafe-activator/index/v2/current.properties: sbt.TranslatedIOException: Error opening http://downloads.typesafe.com/typesafe-activator/index/v2/current.properties: java.net.UnknownHostException: downloads.typesafe.com"