Charting: dates on x axis.
Remove unused :show_title param logic
More chart styling options.
Charting: small style and typo fixes.
Charting: Remove color css attribute.

Setting of the color to white hides important chart elements.
Charting: remove extra title in Optimize/Utilization/Details.
Charting: fix rubocop complaints.
Merge pull request #905 from martinpovolny/chart_dates

Charting: more styling.