Merge pull request #218 from hintjens/master

Updated man pages
Fix. Set correct peer status on HELLO

Suppouse we get HELLO with group `CHAT` and status `1`.
If we set peer status and then call `zyre_node_join_peer_group` then
peer status become to `2`.
So we should set status after we call `zyre_node_join_peer_group`.
Fix. Set correct peer status on HELLO

Suppose we get HELLO with group `CHAT` and status `1`.
If we set peer status and then call `zyre_node_join_peer_group` then
peer status become to `2`.
So we should set status after we call `zyre_node_join_peer_group`.
Merge pull request #219 from moteus/master

Fix. Set correct peer status on HELLO
Started implementation of gossip discovery

Selftest is in zyre_node_test

Body of test is still empty, we do gossip setup but don't yet handle
DELIVER messages from gossip network. This commit is meant to show
the Zyre API for gossip discovery.
Connect properly to peers via gossip protocol

Now handles discovery via gossip network as an alternative to beaconing.
The zyre_test method shows an example of this.

This means we can now run Zyre clusters over inproc or IPC rather than
only TCP.