Fixes for LOGSTASH-827 and LOGSTASH-841
Adding a solution for testing output/email using rumbster (https://github.com/aesterline/rumbster)
Fix and test for LOGSTASH-559 authenticationType=>nil
Merge pull request #381 from wiibaa/emails

Rebase PR-337 Emails output Fixes: LOGSTASH-827 and LOGSTASH-841