New --recursive option, New DB version, md5 on email attachments, initial elasticsearch 0.20 support, fixed gzip bug

* When using -R for a directory, can now use --recursive to descend directory
* New DB version (run db.pl host:port upgrade)
* Calculate md5 on email attachments
* Initial elasticsearch 0.20 support
* Fixed some more gzip decoding bugs, needs to be rewritten