=pro integrate post-Scala-2.10 dependencies with other dependency declarations

As a suggestion wrt @bantonsson's [comment on another PR](https://github.com/akka/akka/commit/8fb6e40a7f864147134a715ba4ee6830fb6cb8a0#commitcomment-7745214).
Yeah it's tough, not a deal breaker - easy enough to navigate to here from use-site.