Optimization of App#initialize

This is potentially a slow initialization since a config like {:root, :relative_paths, :absolute_paths} will reassign paths 3 times (see Root#assign_paths)

    # Creates a new App with the given configuration.  
    def initialize(config={}, logger=DEFAULT_LOGGER)
      super()
      
      @state = State::READY
      @queue = Support::ExecutableQueue.new
      @aggregator = Support::Aggregator.new
      @dependencies = Support::Dependencies.new
      
      reconfigure(config)
      self.logger = logger
    end

The assigned configurations should be removed from config and reassigned as one... the optimization is probably best done in Root itself, within reconfigure.