Merge pull request #124 from hintjens/master

Fixed install of public API
Merge pull request #125 from hintjens/master

Cleanups to zyre_event class
Merge pull request #126 from hintjens/master

Most critically, renamed logger to zlogger
And the show can go on ;)
extended zyre_event with an send API
fixed comment
Merge pull request #127 from sappo/master

 extended zyre_event with a send API
Handles multi-part messages on SHOUT and WHISPER

- added a "msg" field type to the message codec