Update to version 7.4   see README for full details

Chris;
A number of updates/fixes to the bounce handler.  
RFC1893 -> RFC3463 (and pull all the descriptions from IANA)
Better autoresponder handling (returning type 'autoresponder' if it things it's an out of office type reply)
Better error handling 
remove implode on strings
more isset() around things to avoid PHP errors

plus I added a couple of new example emails which caused the old one to choke