Move partial templates to their own files.
Fix version string
Implement Akka router for server info actors.

With a single actor, server info messages will stack up. If an offline server
gets in, it will be a minimum of the timeout value before it replies. Using
a router and multiple actors lets us avoid that delay.
Refactor Server config object and start method

Move the ServerConfig case class into its own file, renaming it to Server.
Add an additional remoteUser property to the Server case class, with a helper
method to determine if a server can be started, and to start the server.

Also factor out the scala-ssh library in favor of jsch. This lets us provide
a private key via variable, which means we can load it from an environment var,
so we can deploy to Heroku.