Configuration object, configure class method, and new starting behavior.

[digitalextremist]

• Create a Celluloid.configure { |config| } interface to setting what would otherwise be global variables.
  • ... or allow passing in a hash to that class method.
• Because of this convention, we only start Actor::System after Celluloid.configure runs ( in either form ) or on its first inclusion... whichever comes first.

This would still be before its first actual use which probably has benefits, because until it is included if it is required, it already began to use resources it may not need to.

So the autostart type behavior would still be there, but it would be more lazy.

[tarcieri]

Closing as stale. If you are still interested in this issue, please reopen it.