Fix ranking display

Add package.json file to .nodemonignore
Flash Messages & Event Bus reintroduced

@mekanics / @swissmanu: please review.
How it's working now is like that:

  * A controller does finish a task
  * It emits an event specialised for this task
  * The FlashMessages Observer will retrieve this
  * Upon next rendering, the client will fetch the flash messages
  	and display them