Merge pull request #66 from hintjens/master

Bunch of changes to server engine generator
Merge pull request #67 from hintjens/master

Switched to new zsys logging facility
Use NULL_event instead of zero, MSVC doesn't like int assignment to event_t
Merge pull request #68 from sappo/master

MSVC fixes
Merge pull request #69 from hintjens/master

Simplified debug output for structures
Merge pull request #70 from hintjens/master

Problem: cannot use zproto for CZMQ itself
Problem: event broadcasts were not working

If the client argument was null, no events were being broadcast.

Solution: fix the code.