before creating own class for area diagramm
area filling for line chart now Working; Implemented in example
added icon for area chart in the table
Merge branch 'version_2.4.0'
made area filling compatible to smoothed curves
fixed bug with mixture of smooth and linear lines
solve wobble issue with bottom line
Merge branch 'version_2_4_2'
integrated changes of version 2.4.1 into area filling
set delegate and dataSource as IBOutlets to link them in interface builder
fixed some bugs
Merge branch 'master' of https://github.com/hackingotter/JBChartView into origin/area