Bump czmq to 1.4.0
Merge pull request #19 from mattconnolly/master

Making ZMQ::Loop#start thread-safe
Fix "‘TRUE’ undeclared"
Bump to zeromq-3.2.3
Release 1.6
Add Matt Connolly as author
Initial barebones ZMQ::Beacon implementation
Do not assume beacon hostname == 127.0.0.1
Also destroy beacon on GC free callback
Implement ZMQ::Socket#disconnect
Oust ZMQ.version2? && ZMQ.version3? apis
Oust ZMQ.stable_version? api
Oust further 2.x and 3.x socket option conditionals and implement missing 3.x specific socket options
Implement ZMQ::Socket#poll
Let ZMQ::Beacon release the GIL on I/O
Bump to czmq 1.4.1
Implement ZMQ::Beacon#pipe
Fix beacon wildcard subscribe
Beacon announce and lookup test case
Release 1.6.1