Add support for HighCharts renderer

[thombergs]

Reported by Rob.A.R.Davis, Sep 11, 2013
What steps will reproduce the problem?

1. No steps to reproduce. Seems to be missing functionality so hoping it could be added in.

What is the expected output? What do you see instead?
Ability to add highcharts renderer functionality to charts

What version of the product are you using? On what operating system?
Wicked Charts 1.5.0 on Windows 7

Please provide any additional information below.
Adding support for renderer calls on charts could allow for more expansive chart options (Org charts or shaded areas on charts, for example)

[thombergs]

#1 Rob.A.R.Davis
Link to relevant API page: http://api.highcharts.com/highcharts#Renderer

I could be missing this in the existing release, but was unable to find it in the current release or in trunk