New module, small aesthetic code changes
* modules/dos/nud.py
  -- New IPv6 DoS abusing the neighbor discovery protocol
* modules/dos/dos.py
  -- added the session viewer method
* modules/dos/dhcp_starvation.py
  -- formatting
* modules/dos/ndp_dos.py
  -- More explicit name
* modules/services/service.py
  -- formatting
* modules/stream.py
  -- DoS modules can now be stored as sessions