Implement Storage + EntityListener for order & site stats #258
Description
Add everything needed to support persisting OrderStats and SiteVisitStats (via StatsAction & StatsStore) in our Storage framework:
- Data model
- NSMO's
- Yosemite updates
- Tests
Once that ☝️ is completed, wire up a few entity listeners on the dashboard instead of returning data results in the 'StatsAction' callback.
Ref: #177