Merge pull request #858 from lalebarde/master

add proxy_chain, a multi proxies chaining in the same thread feature
[libzmq] const string p -> const string& p (#860)
Merge pull request #861 from pavel-pimenov/master

[libzmq] const string p -> const string& p (#860)
Fixed man page for zmq_proxy_hook

- spaces instead of tabs for indentation
- fixed levels under EXAMPLE USAGE
- added to Makefile.am
Merge pull request #862 from hintjens/master

Fixed man page for zmq_proxy_hook
Test for 127.0.0.1 at tests startup
Merge pull request #863 from hintjens/master

Test for 127.0.0.1 at tests startup
Fix cmake build
Merge pull request #864 from ricnewton/master

Fix cmake build
Fixed issue #865 - validation on ZMQ_TCP_KEEPALIVE
Merge pull request #866 from hintjens/master

Fixed issue #865 - validation on ZMQ_TCP_KEEPALIVE
add proxy_open_chain