Update ZMQ package
Merge pull request #82 from mjio/update-zmq-package

Update ZMQ package
remove unused helper methods
oops
Merge branch 'master' of github.com:chuckremes/ffi-rzmq
ZMQ::Socket#getsockopt: add support for LAST_ENDPOINT and MULTICAST_HOPS

This only adds the behavior only if libzmq3 is used (not version 2).
Merge pull request #83 from paddor/master

ZMQ::Socket#getsockopt: add support for LAST_ENDPOINT and MULTICAST_HOPS