added DropletNotification class; splited old code to the new class methods; added methods for create and destroy droplets
created method for DropletNotification class that check all created or destroyed droplets
changed method notify-hipchat: added two new notifications - for created and detroyed droplets
made create_droplet, destroy_droplet, get_changes, notify_hipchat, get_added_and_destroyed_elements methods protected; create droplet-daemon to run application at background
created droplet-notifications daemon
changed method class method check_all_changes: now it checking correct  old and current states