updates for Bro 2.3

## Brian Kellogg 12/2/2014
## Updated for Bro 2.3 - DNS::do_reply is now a hook not an event, 
## Added logic to check for conn$dns field before looking for conn$dns$query field - if ((c?$dns) && (c$dns?$query))
Update tor2web.bro

## Brian Kellogg 12/2/2014
## Updated for Bro 2.3 - DNS::do_reply is now a hook not an event, 
## Added logic to check for conn$dns field before looking for conn$dns$query field - if ((c?$dns) && (c$dns?$query))
Merge pull request #4 from theflakes/master

Updates for Bro 2.3