v1.6.0

• Core: plugin macros (#19). This feature lets you reuse output plugin definitions.

• Fluentd: add fluent-plugin-kafka to base image (@dimitrovvlado)

• Fluentd: add fluent-plugin-mail to base image

• Fluentd: add fluent-plugin-mongo to base image

• Fluentd: add fluent-plugin-scribe to base image

• Fluentd: add fluent-plugin-sumologic_output to base image