rename agent_ping_peer zyre_nore_ping_peer
Merge pull request #132 from sappo/master

easier api for sending shouts and whispers
Modified shout/whisper API

- removed zyre_event_send_shout/whisper which was redundent with
  zyre_shout/whisper
- changed zyre_shout/whisper to take peer/group name as second
  argument, as string, rather than as message
- added zyre_shouts/whispers to send string to peer/group in a
  single step, which is the 90% use case
- modified all test tools to use string sending methods

Notes

- when a method uses class X as first argument that means the method
  lives inside class X, thus zyre_whisper (zyre_t *self,...)
Merge pull request #133 from hintjens/master

Modified shout/whisper API
Added zyre_stop method

- sends out beacon with port zero
- when node gets such a beacon, removes it from tables
- also updated RFC 20 to cover this
Merge pull request #134 from hintjens/master

Added zyre_stop method
updated README to use latest
- zyre API & examples
- zyre_event API & examples