Preparations for highcharts-3d module in parts.
3D: Math, Globals
3D: Renderer, Column, Axis, Chart
3D: Columns
3D: Axis, added gridlines
3D: Cleaned code
3D: added tick marks and labels
3D: Fixed bug where no stacking gave wrong depth
3D: Cleaning of code
3D: Change frame x y to bottom back side
3D: changed frame x/y to bottom/back/side
Merge branch 'highcharts-3D' of https://github.com/highslide-software/highcharts.com into highcharts-3D
3D: plotbackground, oppposite Y-Axis
3D: plotbackground and opposite y axis
Merge branch 'highcharts-3D' of https://github.com/highslide-software/highcharts.com into highcharts-3D
3D: Rewrote the frame
3D: plotlines and bands
3D: fixed issue with no grouping and no stacking
3D: fixed issue with opposite y axis
3D: Basic Pie functionality