Document the flapping plugin
Add tests for circus.stats.collector
add tests for the stats publisher
Add coverage for circus.stats.streamer
Improve documentation for the stop command

 * fix title that was saying that this command stops the arbiter
 * reference the graceful_timeout option
 * various grammar fixes and wording improvements
important typo (send SIGKILL and not SIGTERM)
reorder import order in circus.util
remove import_module since we don't use it anymore
add coverage for circus.util
Move tests .ini files in sub folder

As per issue #468
Fix lines too long
end of #529 fix (thanks to amarandon) ?