Dashboard charts

Implemented 3 dashboard charts:
- deal stage pie chart
- deal status pie chart
- this month revenue bar chart

At the beginning, I wanted to use http://www.chartjs.org, but it doesn't display pie chart labels which makes them quite useless. So I used fork of this project https://github.com/FVANCOP/ChartNew.js. It seems it has few differences, but we can still decide which one is better.