Chart page

dynamic positioner for multi-series; removed right hand axis for pop
pyramid
Chart Page

Ordered bar chart: removed symbol and added label;
Pop Pyramid: added white grid lines over bars;
Bar chart: added grid lines and plot line at zero mark for baseline
Chart Page

Multi-series colours and tooltip positioning
Chart Page

Multseries tooltip style, position and format
Merge pull request #1 from mcoulthurst/master

Merge master to ghpages