PostgreSQL sniffer and new menu support.
* modules/services/access_point.py
  -- comments
* modules/services/ftp.py
  modules/services/http.py
  modules/services/smb.py
  modules/services/ssh.py
  -- adjusted timeout to 3s
* modules/sniffers/database_sniffer.py
  modules/sniffers/parser_postgres.py
  -- Added first version of a PostgreSQL query parser.
     Parses most of the same stuff the MySQL one does;
     password hashes, usernames, queries, responses, etc.
* modules/sniffers/parser_mysql.py
  -- Added some debugging
* modules/util.py
  -- Added support for input buffering.  This allows you
     to move quickly through menus.  Enter space delimited
     integers to move through menus: '3 4' will automatically
     launch the database sniffer. '0 7 2' will move from the sniffer
     menu back to the session viewer and launch View Session, etc.