continues to refactor code and reinserts tables into dashboard main view
further fixes to dashboard main view, fixes shopkeeper's credits and total water
fixes operations dashboard
removes error_by_hubs method from dashboard
fixes sorting for credits_bought_by_kiosk
fixes broken rspec tests, adds guard clause for null cases in errors_by_hub_chart and provider-based methods
removes paloma gem and reimplments use of script tag to pass information from back-end to front-end
Merge pull request #2 from DBC-Susteq/op-sans-paloma

Removes Paloma