Fixed issue #366
Whitespace & formatting fixes
Fixed a comment
Debugging CI build errors
Updating man pages
Use bogus hostname if getnameinfo fails
Fixed issue #370
Fixed #370 in zmsg, zcert, zcertstore, zauth
Removed dependency on ZMQv4 proxy functions

- re-implemented proxy logic in zproxy background task
- added optimization for polling costs, by looping on all messages
  coming from a socket, before returning to polling. This makes a
  significant difference on OS/X especially.
- removed checks for zmq_proxy_steerable from configure.ac
Merge pull request #367 from hintjens/master

Fixed issue #366
Merge branch 'master' of github.com:zeromq/czmq