Improve logging and error catching a bit for AppActor
Update sbt-remote-control to 15488ad3e28dcfceb4b61dd03fe5c6ee2f4ccf6f

This is a custom build with a couple of fixes:
 * handle socket exceptions instead of exploding
 * receive early pre-boot logs
Merge pull request #595 from typesafehub/wip/havocp-app-cache

Attempt to fix losing track of sbt on reload