v4.4.0 / 2016 Jun 10

[com.taoensso/timbre "4.4.0"]

This is a major, non-breaking release, enjoy :-)

• New: Add support for appender-level ns filters [#171]
• New: Add 3rd-party logstash appender [#166 @dfrese]
• New: Add PostgreSQL appender [#160 @yuliu-mdsol]
• New: Add Slack appender [#159 @sbelak]
• Fix: Make rotor appender thread-safe [#168 @mikesperber]
• Fix: Don't cache cljs console appender's js/console [#165]
• Fix: Fix surprising merge-config nil behaviour [#163]