Merge pull request #68 from hintjens/master

Bumped version for next release
Merge pull request #70 from hintjens/master

Backported #797
Merge pull request #71 from hintjens/master

Added man page for zmq_proxy_steerable
Resolve issue #939

This bug is caused by fq which can terminate pipe before sending all
frames of a message first. So sometimes two messages were mixed and this
confused ZAP handler.

This patch just modifies one pipe parameter so that socket consumes all
messages before dropping the pipe.