Improvements towards new datasource remoting.

This commit includes upgrading to akka 2.2.1, updates to the dev subproject
to run under akka 2.2.1, as well as new changes to the Server actor infrastructure,
a new RemoteOperation wrapper operation, and a distribute() method on DataSourceLike.
Fix command line argument for dev project port.
Mark Cache as Serializable.
Upgrade Server cluster code and dev project for akka 2.2.1.
Merge pull request #593 from joshmarcus/topic/ds_remoting

Improvements towards new datasource remoting.