Update README.md
Merge pull request #456 from jeffreyjackson/patch-1

Update README.md
Fix log message during client startup

The format of the old message was slightly bothersome. This looks a bit
better.
Merge pull request #458 from awiddersheim/fix_agent_startup_message

Fix log message during client startup
bitrig uses gmake.
Merge pull request #460 from ddpbsd/bitrig

bitrig uses gmake.