Fixed hardcoded table name and refactored for less warnings on concatenated query strings.
Refactored SQL queries by day.
Refactored graphs to weekly data points.
Refactored Chart.js data argument passing.
Added method for Chart.js doughnut chart.
Switched doughnuts to Chart.js with more distinct coloring.
Disabled points on are graphs.
Implemented passing ymax limit to area graphs.
Switched version usage graphs to areas.
Merge pull request #2 from Rarst/version-usage

Revamped versions usage page