Prepared for ZeroMQ 4.0
Merge pull request #178 from matehat/master

Very simple patch adding zmq_disconnect support
remove waf support

we are already requiring node >= 0.7.9, no sense in keep wscript around
fix logic  in ZMQ_CAN_DISCONNECT macro
Merge pull request #188 from mscdex/fix-macro

fix logic in ZMQ_CAN_DISCONNECT macro
Merge pull request #187 from mscdex/remove-waf

remove waf support