Merge pull request #120 from sappo/master

updated chat to use new zyre api
Merge pull request #121 from sappo/master

wrapped message data into an own structure
Merge pull request #122 from sappo/master

zyre_msg api extended
Merge pull request #123 from sappo/master

renamed zyre_msg to zyre_event so it wont be confused with zre_msg
Fixed install of public API

- zyre.h now also includes zyre_event.h
- internal headers files no longer installed
Merge pull request #124 from hintjens/master

Fixed install of public API
Cleanups to zyre_event class

- use enum for event type
- fixed method names to be a little more readable
- fixed various memory leaks
- wasn't getting group name for JOIN/LEAVE
- fixed comments in header file, used for man page
- added minimal explanation of class in header, for man page
- added man page to doc/Makefile.am and generated zyre_event.txt
Merge pull request #125 from hintjens/master

Cleanups to zyre_event class