Support spline chart type
Donut chart
Funnel chart
Radar chart
Column + spline + pie demo
Refactoring
Solve browser showing empty html document issue
Update area chart demos
Update areaspline chart demo
Update bar chart demos
Update column, combination and donut demos
Update funnel, line and pie demos
Update radar, scatter and spline demos
Update usage example
Add stacked area chart type
Add percent and stacked bar and column chart types
Prepare to support other js libraries
Reorganize the solution
Update the demos
Missing import declarations