Backwards-compatible changes to support [ZeroMQ Curve](http://curvezmq.org/) authentication
2.7.3
Minor changes: make Lisp message slots writeable by default, import core-messages as part of the Lisp package, fix a bug in de/serialization of function call argument order in Lisp.
2.7.2
* Fixes a discrepancy between Lisp's and python's treatment of keyword arguments. * Option to distinguish None from False on the Lisp side.
2.7.1
2.7.0
2.6.1
Bugfixes --------- - This patch release fixes a missing import in the message spec in v2.6.0.