many bugfixes! and updating examples
fixed line chart example
fixed merge issues
fixed diff displaying in code
created alias for DonutChart that extends PieChart
lots of bug fixes! adding "slices" option to PieCharts
added slices option to PicCharts
Merge branch 'piechart'
updated pie chart examples
Merge branch 'piechart'
added optionsToJSON() on master chart
updated areachart examples