Merge pull request #363 from smfreegard/master

Add smtp_client idle timeout and add keepalives
Merge pull request #364 from smfreegard/master

Fix read of tls_key/cert file to binary
Update connection.js

The patch will make the deny_includes_uuid work according to the manual.
Merge pull request #367 from endreszabo/patch-1

Fix deny_includes_uuid length truncation in connection.js
Minor improvements to MessageSniffer plugin