Clarify that OK events cannot be filtered.
Added clarficiation for occurences and refresh
Update rabbitmq.md

making ssl_listeners enabled by updating Erlang
Merge pull request #146 from solarkennedy/severity_clarity

Clarify that OK events cannot be filtered.
Merge pull request #148 from mapav/patch-1

Update rabbitmq.md
Merge pull request #147 from solarkennedy/faq_occurences

Added clarficiation for occurences and refresh