Thermometer chart

I was in need of a Thermometer Chart for one of the reports I was working on, so I went ahead and added that capability.  This is based on JFreeChart's ThermometerPlot.

Please see below the screenshot of the updated "Edit Chart" window
![chartedit](https://cloud.githubusercontent.com/assets/4562243/5554442/e731913a-8c7b-11e4-8b7e-2b40962c20d1.png)

Please see below the screenshot of a sample Thermometer Chart
![sampleplot](https://cloud.githubusercontent.com/assets/4562243/5554447/a3728fc0-8c7c-11e4-9ae6-70dddf606a03.png)