Added shell for stats service to prep for batching remote calls
Renaming LocalService to LocalCoreDataService for appropriateness
Calling all endpoints on batch, need to map and return data still
Finished mapping all batch data to collections for passback
Added a failure completion handler to the stats service
Ripped out individual refresh calls and replaced with a single reload
Add missing failure completion handler call
Add WPAccount as a parameter to stats service

This dependency will have to get removed/resolved properly when the service is exported to an external library.
Remove StatsApiHelper (pre-batch)
Merge branch 'develop' into feature/1686-batch-stats
Added first unit test for WPStatsService
Refactored stats services after testing exposed some design issues

Also added beginnings of remote service test
Re-added missing test
Renamed tests to be more helpful, added date calc test
Merge branch 'develop' into feature/1686-batch-stats

Conflicts:
	Pods/Pods.xcodeproj/project.pbxproj
Sent wrong parameters to NSDateComponents calculation
Merge branch 'develop' into feature/1686-batch-stats

Conflicts:
	WordPress/Classes/StatsApiHelper.m
	WordPress/WordPress.xcodeproj/project.pbxproj
Merge pull request #1714 from wordpress-mobile/feature/1686-batch-stats

Use a single call to fetch stats instead of 13 separate ones