vapor v0.11.0

Big changes in this one.

Release notes:

• added generic ability to register handler for any emitter/plugin
• decoupled Vapor from file system
  • added new readFile / writeFile events
  • added simple fs handler for these events
• added hasHandler method to API
• marked most of Vapor properties as private
• added new servers property to Vapor - use it to set your own up-to-date list of Steam servers
• renamed error event to disconnected
• added new message:* events
• removed winston dependency --> this code will be moved to separate Vapor plugin
• added new built-in plugin: console-logger
• added new built-in plugin: debugger
• removed faulty steamGameCoordinator handler
  • added new example External Handlers which shows how to instantiate other handlers
• lot's of small fixes
• updated all dependencies
• updated docs