Merge pull request #228 from hintjens/master

Problem: zyre_peer_connect using bad endpoint
Merge pull request #231 from hintjens/master

Send dump state to sys log
Windows compilation fixes for znode.
interface is a reserved word in MSVC, and cast issues
Merge pull request #232 from twhittock/win_node_fix

Windows compilation fixes for znode.
zyre_node_stop was accessing self->beacon after it had been destroyed, causing zbeacon_socket() to assert
Merge pull request #234 from cekoski/master

zyre_node_stop was accessing self->beacon after it had been destroyed, c...
use zstr_free
Merge pull request #235 from jossgray/master

Use zstr_free in zyre_set_header.
zyre_node_start was not passing the correct port number in the beacon message
Merge pull request #236 from cekoski/master

zyre_node_start was not passing the correct port number in the beacon message
Whitespace fix
Minor code cleanups