Add TOC to multiline codec doc
Add change log entry for PONG
Move idle-timeout and spool-size cmd line to config file
Mark persist directory as requiring restart
If Travis failure occurs due to shutdown hang - trigger a stack trace for analysis (happened only once though)
Fix multiline doc TOC positioning
Improve config check during startup, tweak some logging, set to v0.11
Improve startup error handling - move potential failures from post-startup into startup to allow startup failure
Logging tweaks
Update change log
Fix missing server name validation in ruby gem client used by logstash output plugin