New port for secure messenger Bitmessage (needs to be checked in)

[Yuri]

I just created a port for this new near-instant messenger replacing 
traditional mail and IM clients. It allows to deeply encrypt the 
messages, therefore avoiding message snooping. It also allows to hide 
the identities of sender and recipient of the message.

http://www.freebsd.org/cgi/query-pr.cgi?pr=184322
http://en.wikipedia.org/wiki/Bitmessage

This port needs to be checked in.

Thank you,
Yuri