Trigger test travis build
Enabling SBT cached resolution

Now that we have Travis docker caching, this is much more
useful. See https://github.com/guardian/gu-who/pull/42

http://www.scala-sbt.org/0.13/docs/Cached-Resolution.html
trigger another test build
Merge pull request #43 from guardian/sbt-cached-resolution

Enable sbt cached dependency resolution