Adds simple web interface for status & ...

spinning up / down additional workers on a topic
It's random. The app would typically configure it. In dozer, that looks like this:

```ruby
module Dozer
  class Application < Emque::Consuming::Application
    config.consuming_adapter = :rabbitmq
    config.rabbitmq_options = { :url => ENV["RABBITMQ_URL"] }
    config.error_handlers << Proc.new {|ex, context|
      Honeybadger.notify(ex, :context => context)
    }
    config.status = :on
    config.status_port = ENV["DOZER_STATUS_PORT"] || 9292
    config.status_host = ENV["DOZER_STATUS_HOST"] || "0.0.0.0"
  end
end
```