first stab at bundling libsodium
update MANIFEST.in for libsodium
don't install libzmq, lib sodium when zmq should be bundled
don't bundle libsodium on Windows
cleanup bundling libsodium a bit
Merge pull request #480 from gward/master

fix typos in "stonehouse" security example
update security examples

some typos, fix handling of whitelist/blacklist
Merge pull request #482 from minrk/security-examples

update security examples
skip security tests if libsodium is unavailable
Merge pull request #477 from minrk/libsodium

first stab at bundling libsodium
Merge pull request #481 from minrk/skip-security

skip security tests if libsodium is unavailable
call zmq_errno as soon as possible

avoids errno being clobbered by other operations before it's retrieved
allow unicode addresses in cffi backend

It seemed to work already, but I'm not sure why.
This at least makes it explicit.
Merge pull request #483 from minrk/checkrc

call zmq_errno as soon as possible
Merge pull request #484 from minrk/cffi-connect-unicode

allow unicode addresses in cffi backend
14.1.0-dev
allow external backends, specified via ZMQ_BACKEND env
Merge pull request #485 from minrk/external-backend

allow external backends, specified via ZMQ_BACKEND env
allow creation of sockets from explicit handlers

and make _handle property available on both ctx and socket
remove some redundant travis matrix points