Added zyre_event man page to makefile
Minor fix to project header
Renamed logger due to conflict with Linux shell command

- was doing fun things when installed and run by accident
- such as breaking zyre_selftest due to random node hanging around
- also renamed other tools for consistency
Merged patches with upstream
Merge pull request #126 from hintjens/master

Most critically, renamed logger to zlogger
And the show can go on ;)