Move to Play 2.3.2

This involved purging the scala 2.10 leftovers on the classpath (both sbt-remote-control and activator-template-cache were depending on 2.10 accidentally) in order to get offlineTests to pass.
It's unclear why things passed with 2.3.1 and 2.3.2 broke them, but in any case, should be
working now.

This PR also jumps to newer templates which are published vs. 2.3.2.