Add collector for darner: https://github.com/wavii/darner
PEP8 fixes
Merge pull request #719 from gbock/darner

Add collector for darner: https://github.com/wavii/darner
Add multiple collections to test counters for darner.
cleanup quotes in bean names... looking at you Kafka
Merge pull request #721 from ewdurbin/bad_beans

cleanup quotes in bean names... looking at you Kafka
Merge pull request #720 from gbock/darner

Add multiple collections to test counters for darner.