A lot o changes...

Added the point to Chart.ux.Highcharts class on all series (serie.chart) added to the charts. Useful with pointclick event when you need to use an Ext.Component. 
Examples:
```javascript
pointclick:{
   buffer:10,
   fn:function(serie,point,record,event){
      //Get parent window to replace the chart inside (me)
      var window=this.chart.up('windows');
      ....
   }
}
```
Added Chart.ux.RPieClass with Highcharts custom Serie rpie. You can use Radius Pie with standard Highcharts.

Added samples for Radius Pie Chart.

Solved problem with LoadMask decrepated.