Remove useless mail event with entire that counts entire box as new after openBox

[freman]

varImap=require('map');varimap=newImap(opts);imap.once('ready',function(){imap.openBox('INBOX',true,function(err,box){console.log('Got inbox',box.messages.total);});});imap.on('mail',function(new){console.log('New mail',new);});

Before this patch the above code would print out

Got inbox 5052
New mail 5052
# Then when an actual message came in
New mail 1

Now the code above prints

Got inbox 5052
# Then when an actual message comes in
New mail 1

[bengotow]

Any updates on this? It seems this is a pretty clean fix to #445, would be really great to merge it in.

[jstejada]

@mscdex any chance we could merge this in?