Bump to Play 2.3.6, akka 2.3.6 and related

I only need sbt-rjs updated to 1.0.3 since I'm not using any other sbt web plugins. sbt-rjs 1.0.5 works for me, but I was just wondering why you aren't encouraging people to use the latest plugins. If it's too big of risk, then I'm good with the commit.