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Update 0MQ
Try ffi-rzmq master
Allow failures on JRuby
Use ffi-rzmq gem
Revert "7777 is overused. Use 7890 instead"

This reverts commit d03055aa3b96cf5f7adb743b060c67f02636aa39.
Bump version to 0.13.0
Disable specs dependent on Reel
Add support for blocks