Merge pull request #202 from hintjens/master

Fixes including provisional fix for #200
Merge pull request #204 from hintjens/master

Set ZMQ_ROUTER_HANDOVER on node inbox
Merge pull request #205 from hintjens/master

Zyre logging system removed
Header cleanup
Merge pull request #206 from mvala/master

Header cleanup
Include chat in build process
Remove unnecessary Makefile.in
Merge pull request #208 from claws/chat_mods

Chat mods

Nice.
demonstrate graceful shutdown
Merge pull request #209 from claws/chat_graceful_shutdown

demonstrate graceful shutdown
Added version number to ZRE spec