NEW port net/czmq

[Rodrigo Mosconi]

Follow a new port  net/czmq.  It is a high-level C bindings for zeromq.

The port is for version 2.2 of czmq.  When the new version (3.0) will be
released, I will update it.

Is this OK?

czmq.tgz
Description: GNU Zip compressed data