Update ChartNew.js

- InGraphData for Pie/Doughnut written after all slices are drawn;
- option inGraphDataMinimumSlice added for Pie/Doughnut : inGraphData not displayed for slices lower than inGraphDataMinimumSlice
   exemple : inGraphDataMinimumSlice : 45 => For all slices lower than 45°, then inGraphData is not written in graph.

![canvas](https://cloud.githubusercontent.com/assets/6121933/4435572/2ba140ac-474b-11e4-9d49-f5a9d45ef815.png)
 

See Issue #100