Resolve LIBZMQ-464

Ref: https://zeromq.jira.com/browse/LIBZMQ-464
Merge pull request #73 from hurtonm/issue_464

Resolve LIBZMQ-464
Ref: https://zeromq.jira.com/browse/LIBZMQ-477
Merge pull request #74 from kdlan/master

Resolve LIBZMQ-477
Fixed man page for zmq_poll
Merge pull request #75 from hintjens/master

Fixed zmq_poll man page
Added deb/rpm package builder scripts