rev the kitten's engine faster

review by @dragos

already deployed in production using:

1. package using sbt assembly,
2. ssh ubuntu@buildbot.typesafe.com cp ~/ghpr2/ghpr-assembly-0.2-SNAPSHOT.jar ~/ghpr2/ghpr-assembly-0.2-SNAPSHOT.jar.old
3. scp target/scala-2.10/ghpr-assembly-0.2-SNAPSHOT.jar ubuntu@buildbot.typesafe.com:~/ghpr2
4. ssh ubuntu@buildbot.typesafe.com sudo initctl restart ghpr2

to roll back:

1. ssh ubuntu@buildbot.typesafe.com cp ~/ghpr2/ghpr-assembly-0.2-SNAPSHOT.jar.old ~/ghpr2/ghpr-assembly-0.2-SNAPSHOT.jar
2. ssh ubuntu@buildbot.typesafe.com sudo initctl restart ghpr2