* Create struct for Slack's receiver settings
* Remove one layer of indirection when building slack notifier
* Delete un-used struct
* Validate against settings struct instead of simplejson object
* Genericize settings marshalling
* Remove repetition between fields on notifier and fields on settings struct
* Rename unmarshal settings wrapper
* Handle comma separated strings at marshalling time rather than validation time
* Address misc review feedback
Alexander Weaver
4df41972f1