Move indicator code to IndicatorModel/Manager
Remove IndicatorsService

Logic moved to more appropriately named services, including
IndicatorJob, Indicator, City
Completely remove IndicatorsService
Move indicator folder to indicator-services
Rename data-service to chart-service
Remove Indicator event object, add TODO comments
Update tests for OTIIndicatorManager
Remove OTIEvents dependency in calculation-controller
Remove dead scope var in indicator-controller
Merge pull request #448 from WorldBank-Transport/feature/indicator-service-refactor-3

Feature/indicator service refactor 3